[conv.rank] Add missing hyphen in "floating point"

Author: eisenwave

source/basic.tex

@@ -6174,7 +6174,7 @@
 defined as follows:
 \begin{itemize}
 \item
-The rank of a floating point type \tcode{T} is greater than
+The rank of a floating-point type \tcode{T} is greater than
 the rank of any floating-point type
 whose set of values is a proper subset of the set of values of \tcode{T}.
 \item