Fix some typos, punctuation, missing words, minor markup.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
diff --git a/Documentation/git-stash.txt b/Documentation/git-stash.txt
index 5723bb0..c0147b9 100644
--- a/Documentation/git-stash.txt
+++ b/Documentation/git-stash.txt
@@ -57,7 +57,7 @@
 
 show [<stash>]::
 
-	Show the changes recorded in the stash as a diff between the the
+	Show the changes recorded in the stash as a diff between the
 	stashed state and its original parent. When no `<stash>` is given,
 	shows the latest one. By default, the command shows the diffstat, but
 	it will accept any format known to `git-diff` (e.g., `git-stash show