Fix misprint + incorrect formatting

Author: apoluektov

ext/rugged/rugged_blame.c

@@ -125,19 +125,19 @@ static void rugged_parse_blame_options(git_blame_options *opts, git_repository *
  *    The last line in the file to blame. Defaults to the last line in
  *    the file.
  *
- *  :track_copies_same_file
+ *  :track_copies_same_file ::
  *    If this value is +true+, lines that have moved within a file will be
  *    tracked (like `git blame -M`).
  *
- *  :track_copies_same_commit_moves
+ *  :track_copies_same_commit_moves ::
  *    If this value is +true+, lines that have moved across files in the same
  *    commit will be tracked (like `git blame -C`).
  *
- *  :track_copies_same_commit_copies
+ *  :track_copies_same_commit_copies ::
  *    If this value is +true+, lines that have been copied from another file
  *    that exists in the same commit will be tracked (like `git blame -CC`).
  *
- *  :track_copies_any_commit_copies
+ *  :track_copies_any_commit_copies ::
  *    If this value is +true+, lines that have been copied from another file
  *    that exists in *any* commit will be tracked (like `git blame -CCC`).
  *

lib/rugged/repository.rb

@@ -190,7 +190,7 @@ def create_branch(name, sha_or_ref = "HEAD")
     # revision - The String SHA1.
     # path     - The String file path.
     #
-    # Returns a String.
+    # Returns a Rugged::Blob object
     def blob_at(revision, path)
       tree = Rugged::Commit.lookup(self, revision).tree
       begin

lib/rugged/tree.rb

@@ -30,7 +30,7 @@ def each_blob
       self.each { |e| yield e if e[:type] == :blob }
     end
 
-    # Iterat over the subtrees in this tree
+    # Iterate over the subtrees in this tree
     def each_tree
       self.each { |e| yield e if e[:type] == :tree }
     end