Backporting reviewer suggested comments from http://cl/214509458 (#49)

Author: rsgowman

firebase-firestore/CHANGELOG.md

@@ -1,17 +1,17 @@
 # 17.1.1
 - [fixed] Fixed an issue where the first `get()` call made after being offline
   could incorrectly return cached data without attempting to reach the backend.
-- [changed] Changed `get()` to only make 1 attempt to reach the backend before
-  returning cached data, potentially reducing delays while offline. Previously
-  it would make 2 attempts, to work around a backend bug.
-- [fixed] Fixed an issue that caused us to drop empty objects from calls to
-  `set(..., SetOptions.merge())`.
-- [fixed] Ensure printf style templates are compile time constants. Previously,
-  some were influenced by error messages. When those error messages contained
-  '%p' (amongst other possibilities), String.format() would throw an exception.
-- [changed] Some SDK errors that represent common mistakes (such as permission
-  denied or a missing index) will automatically be logged as a warning in
-  addition to being surfaced via the API.
+- [changed] Changed `get()` to only make one attempt to reach the backend before
+  returning cached data, potentially reducing delays while offline.
+- [fixed] Fixed an issue that caused Firebase to drop empty objects from calls
+  to `set(..., SetOptions.merge())`.
+- [fixed] Updated printf-style templates to ensure that they're compile time
+  constants. Previously, some were influenced by error messages. When those
+  error messages contained `%p` or other, related tokens, `String.format()`
+  would throw an exception.
+- [changed] Some SDK errors that represent common mistakes, like permission
+  errors or missing indexes, are automatically be logged as warnings in addition
+  to being surfaced via the API.
 
 # 17.1.0
 - [feature] Added `FieldValue.arrayUnion()` and `FieldValue.arrayRemove()` to