wrappers: rename credentials-binding examples

Rename credentials-binding example files to have a dash to correspond to
the YAML key that users will use.

Add the prefix "-full" to indicate that these are full examples where a
user specifies every variable.

Change-Id: Iae52c037b213c8f5511244ba075063e6b1a1f43a

jenkins_jobs/modules/wrappers.py

@@ -2147,7 +2147,7 @@ def credentials_binding(registry, xml_parent, data):
     Example:
 
     .. literalinclude::
-            /../../tests/wrappers/fixtures/credentials_binding.yaml
+            /../../tests/wrappers/fixtures/credentials-binding-full.yaml
             :language: yaml
 
     """