Some internal links to `QSet` methods were missing from the documentation. In particular, all methods that were written with one attribute. It seems that QDoc might automatically recognize method/function links only if they have zero parameters, such that the identifier is followed by `()` directly. To avoid this problem while keeping the current parameter-containing form of the text; each function of the form `functioname(\a parametername)` was changed to `\l {functionname()} {functioname(\a parametername)}. Furthermore, one of those text instances was modified to use `\a` for the parameter name, instead of the previously used `\e`, to enhance consistency. An instance of `operator<<()` was not recognized as a link. To resolve this it was marked with the `\l` command. Fixes: QTBUG-95389 Pick-to: 6.2 6.1 Change-Id: I16b2a7a2fbaf4785c2c6bfa5017a3db46d9db2f4 Reviewed-by: Paul Wicking <paul.wicking@qt.io>