qconfig: Rename the doc link

This was missed during the renaming of the tool. Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: ea4d6dead37 ("moveconfig: Rename the tool to qconfig")
diff --git a/tools/qconfig.py b/tools/qconfig.py
index 8a2384d..07d7838 100755
--- a/tools/qconfig.py
+++ b/tools/qconfig.py
@@ -3,7 +3,7 @@
 
 """Build and query a Kconfig database for boards.
 
-See doc/develop/moveconfig.rst for documentation.
+See doc/develop/qconfig.rst for documentation.
 
 Author: Masahiro Yamada <yamada.masahiro@socionext.com>
 Author: Simon Glass <sjg@chromium.org>