[conv.rank] Avoid hinting that 'bool' be a standard integer type.

Author: jensmaurer

source/basic.tex

@@ -5316,7 +5316,7 @@
 \item The rank of \keyword{char} equals the rank of \tcode{\keyword{signed} \keyword{char}}
 and \tcode{\keyword{unsigned} \keyword{char}}.
 
-\item The rank of \tcode{bool} is less than the rank of all other
+\item The rank of \tcode{bool} is less than the rank of all
 standard integer types.
 
 \item