zfs_metaslab_mem_limit should be 25 instead of 75

[jumbi77]

Motivation and Context

Description

According to current zfs man page zfs_metaslab_mem_limit should be 25 instead of 75

Follow up of PR #12258

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[mmaybee]

@jumbi77 Could you rewrite your commit message so that each line is < 72 characters? You could probably just use:
"zfs_metaslab_mem_limit should be 25 instead of 75"

[behlendorf]

@jumbi77 we went ahead and updated the commit message when merging this to keep the line length under 72 characters. Thanks for catching this issue and opening a PR for it.