minor: gridfs docs

Author: banker

lib/mongo/gridfs/grid.rb

@@ -39,6 +39,9 @@ def initialize(db, fs_name=DEFAULT_FS_NAME)
 
     # Store a file in the file store.
     #
+    # Note that arbitary metadata attributes can be saved to the file by passing
+    # them is as options.
+    #
     # @param [String, #read] data a string or io-like object to store.
     #
     # @options opts [String] :filename (nil) a name for the file.

lib/mongo/gridfs/grid_file_system.rb

@@ -43,6 +43,9 @@ def initialize(db, fs_name=Grid::DEFAULT_FS_NAME)
     # Open a file for reading or writing. Note that the options for this method only apply
     # when opening in 'w' mode.
     #
+    # Note that arbitary metadata attributes can be saved to the file by passing
+    # them is as options.
+    #
     # @param [String] filename the name of the file.
     # @param [String] mode either 'r' or 'w' for reading from
     #   or writing to the file.