[cmp.syn] Rename to [compare.syn] to match the header name

jensmaurer · zygoloid · commit 069a179a0d54 · 2018-06-07T20:14:43.000+02:00
diff --git a/source/support.tex b/source/support.tex
@@ -3710,7 +3710,7 @@
 
 \rSec1[cmp]{Comparisons}
 
-\rSec2[cmp.syn]{Header \tcode{<compare>} synopsis}
+\rSec2[compare.syn]{Header \tcode{<compare>} synopsis}
 
 \pnum
 The header \tcode{<compare>} specifies types, objects, and functions
