Git: Fix typo in comment

Change-Id: I07a7905bed3a46f7fbd60fd0844e9c46d61fbc1f
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/gitclient.cpp

@@ -186,7 +186,7 @@ QStringList BaseController::addConfigurationArguments(const QStringList &args) c
 
     QStringList realArgs;
     realArgs << args.at(0);
-    realArgs << QLatin1String("-m"); // show diff agains parents instead of merge commits
+    realArgs << QLatin1String("-m"); // show diff against parents instead of merge commits
     realArgs << QLatin1String("-M") << QLatin1String("-C"); // Detect renames and copies
     realArgs << QLatin1String("--first-parent"); // show only first parent
     if (ignoreWhitespace())