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

Commit: 
https://github.com/vim/vim/commit/20f48d5b2ddb9fdc29e83f0da6f31f895eaeab47
Author: dundargoc <33953936+dundar...@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

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