doc: Reduce pressure in 'selector' choosing instructions

The sentence "cross your fingers that the reviewer(s) do(es) not
complain" sounds a bit too harsh. That is not the way it is
intended. I hope this very long patch will melt some ice :)

Signed-off-by: Yuri Volchkov <[email protected]>
Reviewed-by: Simon Kuenzer <[email protected]>

Author: yvolchkov

CONTRIBUTING.md

@@ -56,7 +56,7 @@ Where `[selector]` can be one of the following:
            `[component]` is optional
 
 If no `[selector]` applies, define your own and cross your fingers that the
-reviewer(s) do(es) not complain.
+reviewer(s) do(es) not complain. :-)
 
 Sometimes a single change required multiple commit identifiers. In general this
 should be avoided by splitting a patch into multiple ones. But for the rare