[span.elem] Fix misplaced colon (#2007)

Author: jensmaurer

source/containers.tex

@@ -10382,7 +10382,7 @@
 \begin{itemdescr}
 \pnum
 \effects
-Equivalent: to \tcode{return data_;}
+Equivalent to: \tcode{return data_;}
 \end{itemdescr}
 
 \rSec3[span.iterators]{Iterator support}