docs: Fix wrong manual section

W: wrong-manual-section
N:
N:   A manual page usually should contain a .TH header, specifying the
N:   section. The section in this manual page doesn't match with the
N:   section in the filename.
N:   
N:   Refer to the groff_man(7) manual page and the man(1) manual page for
N:   details.
N:   
N:   Severity: warning
N:   
N:   Check: documentation/manual
N:   
N:   Renamed from: manpage-section-mismatch