runtime(doc): mention how to disable folding in diff mode (#13242)

Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a24dd0490de30fd9bc41727d46a427d7c783ab73..493fa879e5c11d9baf593f8f3d2ec261153eff65 100644 (file)
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -2839,7 +2839,8 @@ A jump table for the options with a short description can be found at |Q_op|.
                                When omitted a context of six lines is used.
                                When using zero the context is actually one,
                                since folds require a line in between, also
-                               for a deleted line.
+                               for a deleted line. Set it to a very large
+                               value (999999) to disable folding completely.
                                See |fold-diff|.
 
                iblank          Ignore changes where lines are all blank.  Adds