So in the documentation they had

1.9 Ext4 file system parameters
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As you can see the ‘s’ doesn’t get a ‘-’ under it. So they changed the documentation to:

1.9 Ext4 file system parameters
-------------------------------

so the ‘s’ in parameters gets a dash under it.

this seems to be the standard as everywhere else the dashes go for the same length of characters as the above line. Example:

2.0 /proc/consoles
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The little girl said the ‘s’ in parameters is sad because it didn’t get the dash under it and it was all alone. So they added the dash.

She spotted that there was a missing - in the underline for a heading in a piece of documentation, and her parent helped her submit a fix.