docs: add missing diamond brackets

There were a couple of instances in our manual pages that had an
opening diamond bracket without a corresponding closing one.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-branch.txt

@@ -12,7 +12,7 @@ SYNOPSIS
 	[-v [--abbrev=<length> | --no-abbrev]]
 	[--column[=<options>] | --no-column] [--sort=<key>]
 	[(--merged | --no-merged) [<commit>]]
-	[--contains [<commit]] [--no-contains [<commit>]]
+	[--contains [<commit>]] [--no-contains [<commit>]]
 	[--points-at <object>] [--format=<format>]
 	[(-r | --remotes) | (-a | --all)]
 	[--list] [<pattern>...]

Documentation/git-clone.txt

@@ -259,7 +259,7 @@ maintain a branch with no references other than a single cloned
 branch. This is useful e.g. to maintain minimal clones of the default
 branch of some repository for search indexing.
 
---recurse-submodules[=<pathspec]::
+--recurse-submodules[=<pathspec>]::
 	After the clone is created, initialize and clone submodules
 	within based on the provided pathspec.  If no pathspec is
 	provided, all submodules are initialized and cloned.

Documentation/git-init.txt

@@ -10,7 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git init' [-q | --quiet] [--bare] [--template=<template_directory>]
-	  [--separate-git-dir <git dir>] [--object-format=<format]
+	  [--separate-git-dir <git dir>] [--object-format=<format>]
 	  [--shared[=<permissions>]] [directory]