[basic.link] All names have linkage

Given that the last option is "no linkage", the list is exhaustive
and should not open readers to questioning what other options
might be available if a name merely "can have" linkage.

Author: AlisdairM

source/basic.tex

@@ -2888,7 +2888,7 @@
 
 \pnum
 \indextext{translation unit}%
-A name can have
+A name has
 \defnadj{external}{linkage},
 \defnadj{module}{linkage},
 \defnadj{internal}{linkage}, or