Doc: Fix qdoc command to "\a env"

To fix a qdoc warning. However, qdoc cannot find the function to
bind these docs to in any header file.

Change-Id: I86b88bbd9e6f0731f8f79587981c46b720b4a91f
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/utils/commandline.cpp

@@ -218,7 +218,7 @@ static QStringList doSplitArgsWin(const QString &args, ProcessArgs::SplitError *
     If \a err is not NULL, stores a status code at the pointer target. For more
     information, see \l SplitError.
 
-    If \env is not NULL, performs variable substitution with the
+    If \a env is not NULL, performs variable substitution with the
     given environment.
 
     Returns a list of unquoted words or an empty list if an error occurred.
@@ -254,7 +254,6 @@ static QStringList doSplitArgsWin(const QString &args, ProcessArgs::SplitError *
     \c{foo " bar}.
  */
 
-
 static QStringList splitArgsWin(const QString &_args, bool abortOnMeta,
                                 ProcessArgs::SplitError *err,
                                 const Environment *env, const QString *pwd)