+ - Mark all public API functions (SR_API) with a @since tag which indicates
+ in which release the respective function was added (e.g. "@since 0.1.0").
+
+ If the function has existed before, but its API changed later, the @since
+ tag should mention only the release when the API last changed.
+
+ Example: The sr_foo() call was added in 0.1.0, but the API changed in
+ the later 0.2.0 release. The docs should read "@since 0.2.0" in that case.
+
+ Non-public functions (static ones, and those marked SR_PRIV) don't need
+ to have @since markers.
+
+ The @since tag should be the last one, i.e. it should come after @param,
+ @return, @see, and so on.
+