Clarify :b quoter tweak

It doesn't imply `q`, since `q` has only rudimentary backslashing
and is silent on unrecognized sequences, while in `:b` they throw.

Rakudo impl: rakudo/rakudo@deffe54b8d
Spec:        Raku/roast@284a97d31d

Author: zoffixznet

doc/Language/quoting.pod6

@@ -82,7 +82,7 @@ Short       Long            Meaning
 
 :c          :closure        Interpolate {...} expressions
 
-:b          :backslash      Interpolate \n, \t, etc. (implies :q at least)
+:b          :backslash      Enable backslash escapes (\n, \qq, \$foo, etc)
 
 :to         :heredoc        Parse result as heredoc terminator