[support.srcloc.cons] Use term "default member initialier" rather than

describing it indirectly.

Author: zygoloid

source/support.tex

@@ -3301,7 +3301,7 @@
 
 \pnum
 \remarks
-When a \grammarterm{brace-or-equal-initializer}
+When a default member initializer
 is used to initialize a non-static data member,
 any calls to \tcode{current} should correspond to the location
 of the constructor or aggregate initialization that initializes the member.