This diff does not seem to change anything:

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index eb8a10e..aae9dd1 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -1272,7 +1272,7 @@ softirq. 1.9 Ext4 file system parameters ------------------------------- +-------------------------------

Or am I missing something?

While the number of hyphens is equal in both lines, the first hyphen in thr removed line is a diff char.

The commit does exactly what it says, adding one extra hyphen to go below the 's' at the end of the preceding line.

Good observation!

The section header underline has one "-" added, so the final "s" has a "-" under it.