Updates for beachball master/main rename

Author: ecraig12345

.github/workflows/pr.yml

@@ -5,9 +5,9 @@ name: PR
 
 on:
   pull_request:
-    branches: [master]
+    branches: [main]
   push:
-    branches: [master]
+    branches: [main]
 
 concurrency:
   group: pr-${{ github.ref }}

change/beachball-7ce5bd99-b0fa-461c-9666-dd4fe07b02c4.json

@@ -0,0 +1,7 @@
+{
+  "type": "none",
+  "comment": "Update comments",
+  "packageName": "beachball",
+  "email": "elcraig@microsoft.com",
+  "dependentChangeType": "none"
+}

docs/cli/change.md

@@ -59,7 +59,6 @@ If you have changes that are not committed yet (i.e. `git status` reports change
 
 ```
 $ beachball change
-Defaults to "origin/master"
 There are uncommitted changes in your repository. Please commit these files first:
 - a-new-file
 ```

docs/cli/options.md

@@ -7,7 +7,7 @@ category: doc
 
 # Beachball CLI options
 
-For the latest full list of supported options, see `CliOptions` [in this file](https://github.com/microsoft/beachball/blob/master/src/types/BeachballOptions.ts).
+For the latest full list of supported options, see `CliOptions` [in this file](https://github.com/microsoft/beachball/blob/main/src/types/BeachballOptions.ts).
 
 **Most options can also be specified in the [configuration file](../overview/configuration)**, which is generally preferable as it's easier to read and maintain.
 

docs/concepts/groups.md

@@ -26,7 +26,7 @@ For cases where it's necessary to bump packages together, `beachball` also provi
 
 ### Configuring version groups
 
-Groups can be added to the [configuration file](../overview/configuration). See the [`VersionGroupOptions` source](https://github.com/microsoft/beachball/blob/master/src/types/ChangelogOptions.ts) for full details.
+Groups can be added to the [configuration file](../overview/configuration). See the [`VersionGroupOptions` source](https://github.com/microsoft/beachball/blob/main/src/types/ChangelogOptions.ts) for full details.
 
 | Name                    | Type                         | Description                                                                                                                                             |
 | ----------------------- | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
@@ -56,7 +56,7 @@ If you only want to publish or record changes for certain packages, you should u
 
 ## Grouped changelogs
 
-To show changes for multiple packages in one change file, use the `changelog.groups` option. See the [`ChangelogGroupOptions` source](https://github.com/microsoft/beachball/blob/master/src/types/ChangelogOptions.ts) for full details.
+To show changes for multiple packages in one change file, use the `changelog.groups` option. See the [`ChangelogGroupOptions` source](https://github.com/microsoft/beachball/blob/main/src/types/ChangelogOptions.ts) for full details.
 
 | Name                | Type                         | Description                                                                                                                                             |
 | ------------------- | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |

docs/overview/configuration.md

@@ -67,7 +67,7 @@ To change the `disallowedChangeTypes` for package `foo`, you could add the follo
 
 ## Options
 
-For the latest full list of supported options, see `RepoOptions` [in this file](https://github.com/microsoft/beachball/blob/master/src/types/BeachballOptions.ts).
+For the latest full list of supported options, see `RepoOptions` [in this file](https://github.com/microsoft/beachball/blob/main/src/types/BeachballOptions.ts).
 
 "Applies to" indicates where the settings can be specified: repo-level config or package-level config.
 
@@ -100,10 +100,10 @@ For the latest full list of supported options, see `RepoOptions` [in this file](
 | `tag`                   | `string`                       | `'latest'`     | repo, package | dist-tag for npm when published                                                                 |
 | `transform`             | [`TransformOptions`][4]        |                | repo          | transformations for change files                                                                |
 
-[1]: https://github.com/microsoft/beachball/blob/master/src/types/ChangeFilePrompt.ts
-[2]: https://github.com/microsoft/beachball/blob/master/src/types/ChangelogOptions.ts
+[1]: https://github.com/microsoft/beachball/blob/main/src/types/ChangeFilePrompt.ts
+[2]: https://github.com/microsoft/beachball/blob/main/src/types/ChangelogOptions.ts
 [3]: ../concepts/groups#version-groups
-[4]: https://github.com/microsoft/beachball/blob/master/src/types/BeachballOptions.ts
+[4]: https://github.com/microsoft/beachball/blob/main/src/types/BeachballOptions.ts
 [5]: #determining-the-target-branch-and-remote
 [6]: #glob-matching
 

src/types/BeachballOptions.ts

@@ -69,9 +69,14 @@ export interface RepoOptions {
    * The target branch. In the repo or CLI config, this can be specified without a remote name
    * as long as `repository` is set in `package.json` to allow inferring the correct remote.
    *
+   * This defaults to the default branch of the default remote.
+   * - The default remote is the one matching `repository` in `package.json`, falling back to
+   *   `upstream` if defined, the first defined remote, or `origin`.
+   * - The default branch is the remote's default branch if defined, falling back to
+   *   `git config init.defaultBranch` or `master`.
+   *
    * (In the resolved config used internally, the remote name should *usually* be included,
    * unless neither a remote name nor `package.json` `repository` was specified.)
-   * @default 'origin/master'
    */
   branch: string;
   /**