[meta.endian] Clarify wording regarding size of scalar types

Author: tkoeppe

source/utilities.tex

@@ -16883,7 +16883,7 @@
 
 \begin{itemdescr}
 \pnum
-If all scalar types have size \tcode{1}, then all of \tcode{endian::little},
+If all scalar types have size 1 byte, then all of \tcode{endian::little},
 \tcode{endian::big}, and \tcode{endian::native} have the same value.
 Otherwise, \tcode{endian::little} is not equal to \tcode{endian::big}.
 If all scalar types are big-endian, \tcode{endian::native} is