[PostGIS] #5961: Developer documentation on how to write before/after/comment for upgrading

[PostGIS]

#5961: Developer documentation on how to write before/after/comment for upgrading
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 Reporter:  robe           |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 3.6.0
Component:  documentation  |    Version:  3.5.x
 Keywords:                 |
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 Paul says how to write functions so they are upgradable and how to remove
 is opaque.  We need documentation on how to do this.

 Will live in docs folder as a text file.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5961>
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