RUBY-837 Slight update to options documentation

Author: estolfo

lib/mongo/collection.rb

@@ -550,7 +550,8 @@ def update(selector, document, opts={})
     #   The option is silently ignored by the server and unique index builds using the option will
     #   fail if a duplicate value is detected.
     #
-    # @note See the MongoDB documentation for a full list of supported options by server version.
+    # @note Note that the options listed may be subset of those available.
+    #   See the MongoDB documentation for a full list of supported options by server version.
     #
     # @return [String] the name of the index created.
     def create_index(spec, opts={})
@@ -583,7 +584,8 @@ def create_index(spec, opts={})
     #   The option is silently ignored by the server and unique index builds using the option will
     #   fail if a duplicate value is detected.
     #
-    # @note See the MongoDB documentation for a full list of supported options by server version.
+    # @note Note that the options listed may be subset of those available.
+    #   See the MongoDB documentation for a full list of supported options by server version.
     #
     # @return [String] the name of the index.
     def ensure_index(spec, opts={})

lib/mongo/db.rb

@@ -316,7 +316,8 @@ def collections_info(coll_name=nil)
     #   either we're in +strict+ mode and the collection
     #   already exists or collection creation fails on the server.
     #
-    # @note See the MongoDB documentation for a full list of supported options by server version.
+    # @note Note that the options listed may be subset of those available.
+    #   Please see the MongoDB documentation for a full list of supported options by server version.
     #
     # @return [Mongo::Collection]
     def create_collection(name, opts={})