Resolve conflict between shader uniform tooltips `/**` and general annotation `/**/`.

[magian1127]

see https://github.com/godotengine/godot/issues/91547#issuecomment-2093992570

fix #91547

[akien-mga]

What happens if someone uses:

/**
 * Some description.
 */

with no space (but only end of line, $) on the first line?

IMO this should be supported so you might need to support any whitespace (space, tab) or end of line.

Or alternatively, match /**[^/] instead.

[magian1127]

This PR has been modified again to solve the following 2 problems.

1 Change the regular to \*\*\s start match, to solve the problem of lagging. 2 Add a color_region of /**/ to solve the region interrupt problem. (This is still a stopgap measure, and it would be better to rewrite _get_line_syntax_highlighting_impl .)

[akien-mga]

Thanks!