[ranges.elementsof] Rename stable label "ranges.*" to "range.*" (#5867)

Author: hewillk

source/ranges.tex

@@ -155,7 +155,7 @@
   // \ref{range.dangling}, dangling iterator handling
   struct dangling;                                                                  // freestanding
 
-  // \ref{ranges.elementsof}, class template \tcode{elements_of}
+  // \ref{range.elementsof}, class template \tcode{elements_of}
   template<@\libconcept{range}@ R, class Allocator = allocator<byte>>
     struct elements_of;
 
@@ -2191,7 +2191,7 @@
 denote \tcode{dangling}.
 \end{itemize}
 
-\rSec2[ranges.elementsof]{Class template \tcode{elements_of}}
+\rSec2[range.elementsof]{Class template \tcode{elements_of}}
 
 Specializations of \tcode{elements_of} encapsulate a range and
 act as a tag in overload sets to disambiguate