Review FirebaseSessions non-source files (#13373)

FirebaseSessions/ProtoSupport/Protos/sessions.options

@@ -16,7 +16,7 @@
 #
 # Options for sessions.proto
 #
-# Important: Any strings or repeated fields should be speficied in this file as
+# Important: Any strings or repeated fields should be specified in this file as
 # type:FT_POINTER
 #
 # Eg: `# google_crashlytics.Report.sdk_version type:FT_POINTER`

FirebaseSessions/README.md

@@ -41,7 +41,7 @@ You can override the Settings values fetched from the server using the app's Inf
  - **FirebaseSessionsSampingRate**: Float between 0 and 1 representing how often events are sent. 0 is drop everything, 1 is send everything.
 
 ### Updating the Proto
-#### Prerequesites
+#### Prerequisites
 To update the Sessions Proto, Protobuf is required. To install run:
 
 ```