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

[Christian Brabandt]

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

Commit: https://github.com/vim/vim/commit/20f48d5b2ddb9fdc29e83f0da6f31f895eaeab47
Author: dundargoc <33953936+...@users.noreply.github.com>
Date: Mon Oct 2 21:49:23 2023 +0200

runtime(doc): mention how to disable folding in diff mode (https://github.com/vim/vim/issues/13242)

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

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index a24dd0490..493fa879e 100644
--- 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