Correct casing in sidebar

Signed-off-by: Mark Cocker <mark_cocker@uk.ibm.com>

Author: markcocker

docs/_data/sidebars/cdp_sidebar.yml

@@ -81,7 +81,7 @@ entries:
       url: cdp-Log-and-trace-files
       output: web
 
-    - title: Common Errors
+    - title: Common errors
       url: cdp-Common-errors
       output: web