Correct helm_info return type docs for app_version (#97)

docs/kubernetes.core.helm_info_module.rst

@@ -242,7 +242,7 @@ Common return values are documented `here <https://docs.ansible.com/ansible/late
                     <td class="elbow-placeholder">&nbsp;</td>
                 <td colspan="1">
                     <div class="ansibleOptionAnchor" id="return-"></div>
-                    <b>appversion</b>
+                    <b>app_version</b>
                     <a class="ansibleOptionLink" href="#return-" title="Permalink to this return value"></a>
                     <div style="font-size: small">
                       <span style="color: purple">string</span>

plugins/modules/helm_info.py

@@ -55,7 +55,7 @@ status:
   description: A dictionary of status output
   returned: only when release exists
   contains:
-    appversion:
+    app_version:
       type: str
       returned: always
       description: Version of app deployed