[diff] Rename "basic concepts" to "basics" (cplusplus#2481)

Author: hubert-reinterpretcast

source/compatibility.tex

@@ -94,7 +94,7 @@
 Programs that have a legitimate reason to treat string literals
 as pointers to potentially modifiable memory are probably rare.
 
-\rSec2[diff.basic]{\ref{basic}: basic concepts}
+\rSec2[diff.basic]{\ref{basic}: basics}
 
 \diffref{basic.def}
 \change \Cpp{} does not have ``tentative definitions'' as in C.\\
@@ -1345,7 +1345,7 @@
 // \tcode{int x[2] = \{ 3'4, 5 \};} --- this International Standard
 \end{codeblock}
 
-\rSec2[diff.cpp11.basic]{\ref{basic}: basic concepts}
+\rSec2[diff.cpp11.basic]{\ref{basic}: basics}
 
 \diffref{basic.stc.dynamic.deallocation}
 \change New usual (non-placement) deallocator.