[PostGIS] #5970: Add CoverageClean to "See Also"

[PostGIS]

#5970: Add CoverageClean to "See Also"
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 Reporter:  pramsey        |      Owner:  pramsey
     Type:  defect         |     Status:  assigned
 Priority:  medium         |  Milestone:  PostGIS 3.5.4
Component:  documentation  |    Version:  3.5.x
 Keywords:                 |
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 The invalid edges function and some others should have references to
 coverage clean in their "see also" sections.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5970>
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