Remove doc for removed parameters

Author: tiennou

ObjectiveGit/GTBranch.h

@@ -61,15 +61,13 @@ NS_ASSUME_NONNULL_BEGIN
 /// Designated initializer.
 ///
 /// ref  - The branch reference to wrap. Must not be nil.
-/// repo - The repository containing the branch. Must not be nil.
 ///
 /// Returns the initialized receiver.
 - (nullable instancetype)initWithReference:(GTReference *)ref NS_DESIGNATED_INITIALIZER;
 
 /// Convenience class initializer.
 ///
 /// ref  - The branch reference to wrap. Must not be nil.
-/// repo - The repository containing the branch. Must not be nil.
 ///
 /// Returns an initialized instance.
 + (nullable instancetype)branchWithReference:(GTReference *)ref;