fix: spacing

Author: marco-ippolito

doc/contributing/maintaining-brotli.md

@@ -10,15 +10,14 @@ brotli source files.
 
 Check that Node.js still builds and tests.
 
-## Committing postject
+## Committing brotli
 
 1. Add brotli:
    ```console
    $ git add deps/brotli
    ```
 2. Commit the changes: `git commit`.
 3. Add a message like:
-
    ```text
    deps,test: update brotli to <version>
 

doc/contributing/maintaining-postject.md

@@ -19,7 +19,6 @@ Check that Node.js still builds and tests.
    ```
 2. Commit the changes: `git commit`.
 3. Add a message like:
-
    ```text
    deps,test: update postject to <version>
 

doc/contributing/maintaining-undici.md

@@ -10,15 +10,14 @@ undici source files.
 
 Check that Node.js still builds and tests.
 
-## Committing postject
+## Committing brotli
 
 1. Add undici:
    ```console
    $ git add deps/undici
    ```
 2. Commit the changes: `git commit`.
 3. Add a message like:
-
    ```text
    deps,test: update undici to <version>