[stmt.label] Clarify what it means for labels to be in their own name space.

Author: zygoloid

source/statements.tex

@@ -46,10 +46,15 @@
 \indextext{label!scope~of}%
 The scope of a label is the function in which it appears. Labels shall
 not be redeclared within a function. A label can be used in a
-\tcode{goto} statement before its definition.
+\tcode{goto} statement before its declaration.
 \indextext{name~space!label}%
 Labels have their own name space and do not interfere with other
 identifiers.
+\enternote
+A label may have the same name as another declaration in the same scope or a
+\grammarterm{template-parameter} from an enclosing scope. Unqualified name
+lookup~(\ref{basic.lookup.unqual}) ignores labels.
+\exitnote
 
 \pnum
 \indextext{label!\idxcode{case}}%