patch 8.1.1726: the eval.txt help file is too big
Problem: The eval.txt help file is too big.
Solution: Split off testing support to testing.txt. Move function details
to where the functionality is explained.
diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 3db1190..4a1ea03 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -103,6 +103,7 @@
tagsrch.txt \
term.txt \
terminal.txt \
+ testing.txt \
textprop.txt \
tips.txt \
todo.txt \
@@ -241,6 +242,7 @@
tagsrch.html \
term.html \
terminal.html \
+ testing.html \
textprop.html \
tips.html \
todo.html \