minor #5229 Remove mention of *.class parameters from conventions (jvasseur)

This PR was merged into the 2.3 branch.

Discussion
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Remove mention of *.class parameters from conventions

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
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b7721bc Replace trailing semicolon
8a531eb Remove mention of *.class parameters from conventions

Author: wouterj

contributing/code/standards.rst

@@ -165,10 +165,7 @@ Service Naming Conventions
 
 * Use lowercase letters for service and parameter names;
 
-* A group name uses the underscore notation;
-
-* Each service has a corresponding parameter containing the class name,
-  following the ``SERVICE NAME.class`` convention.
+* A group name uses the underscore notation.
 
 Documentation
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