[mem.poly.allocator.mem] Avoid duplicate colons.

Author: jensmaurer

source/utilities.tex

@@ -12575,8 +12575,8 @@
 \begin{itemdescr}
 \pnum
 \effects
-Allocates and constructs an object of type \tcode{T}, as follows:
-equivalent to:
+Allocates and constructs an object of type \tcode{T}, as follows.\newline
+Equivalent to:
 \begin{codeblock}
 T* p = allocate_object<T>();
 try {