[PostGIS] #5638: Need some more developer documentation

[PostGIS]

#5638: Need some more developer documentation
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 Reporter:  robe           |      Owner:  robe
     Type:  task           |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 3.5.0
Component:  documentation  |    Version:  3.4.x
 Keywords:                 |
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 strk,

 Our upgrade machinery is great.  I love what you've done with the replaces
 comments etc. But I can't find where this is explained.

 The closest thing I see to developer documentation we have is

 https://git.osgeo.org/gitea/postgis/postgis/src/branch/master/STYLE

 I think we need some better developer documentation, and it probably
 should live in the repo since each new version of PostGIS might add some
 developer niceties, like your handy replaces construct.

 Note sure what this document should be called or if the STYLE guide should
 be renamed to accommodate how our upgrade plumbing works
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5638>
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