Add formatting for directories. (#4595)

Author: ryanwilson

AddNewPod.md

@@ -35,12 +35,12 @@ for FIRComponent registration. See examples of setting `GCC_PREPROCESSOR_DEFINIT
 The Firebase library `Foo` should be defined in `FirebaseFoo.podspec`. All of its
 contents should be in the `FirebaseFoo` directory.
 
-* FirebaseFoo/Sources - All source. Directory structure is up to the library owner. Any code from a
+* `FirebaseFoo/Sources` - All source. Directory structure is up to the library owner. Any code from a
 non-Google open source project should be nested under a `third_party` directory.
-* FirebaseFoo/Sources/Public - Public Headers.
-* FirebaseFoo/Sources/Private - Private Headers (headers not part of public API, but available for
+* `FirebaseFoo/Sources/Public` - Public Headers.
+* `FirebaseFoo/Sources/Private` - Private Headers (headers not part of public API, but available for
 explicit import by other Firebase pods)
-* FirebaseFoo/Tests/Unit - Required (If the library only has unit tests, `Unit` can be omitted.)
-* FirebaseFoo/Tests/Integration - Encouraged
-* FirebaseFoo/Tests/Sample - Optional
-* FirebaseFoo/Tests/{Other} - Optional
+* `FirebaseFoo/Tests/Unit` - Required (If the library only has unit tests, `Unit` can be omitted.)
+* `FirebaseFoo/Tests/Integration` - Encouraged
+* `FirebaseFoo/Tests/Sample` - Optional
+* `FirebaseFoo/Tests/{Other}` - Optional