Fix @format decorator doc not escaping correctly (#1851)

Author: timotheeguerin

common/changes/@typespec/compiler/timotheeguerin-patch-1_2023-04-24-16-51.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@typespec/compiler",
+      "comment": "Fix `@format` decorator doc.",
+      "type": "none"
+    }
+  ],
+  "packageName": "@typespec/compiler"
+}

docs/standard-library/built-in-decorators.md

@@ -108,7 +108,8 @@ message: string;
 ### `@format` {#@format}
 
 Specify a known data format hint for this string type. For example `uuid`, `uri`, etc.
-This differ from the
+This differs from the `@pattern` decorator which is meant to specify a regular expression while `@format` accepts a known format name.
+The format names are open ended and are left to emitter to interpret.
 
 ```typespec
 dec format(target: string | bytes | ModelProperty, format: string)

packages/compiler/lib/decorators.tsp

@@ -96,7 +96,7 @@ extern dec error(target: Model);
 
 /**
  * Specify a known data format hint for this string type. For example `uuid`, `uri`, etc.
- * This differ from the @pattern decorator that is meant to specify a regular expression while @format takes in a known format name.
+ * This differs from the `@pattern` decorator which is meant to specify a regular expression while `@format` accepts a known format name.
  * The format names are open ended and are left to emitter to interpret.
  *
  * @param format format name.