docs: PG 12 release notes, support functions

Move support function mention to the proper section, and reword.

Reported-by: Tom Lane
Discussion: https://postgr.es/m/5121.1558472431@sss.pgh.pa.us

diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
index dcce866892913ffae5e2c66d88d66994cc2a5c04..d80d89e6a2808b29bbf6ecbf56f596c2db1f8d43 100644 (file)
--- a/doc/src/sgml/release-12.sgml
+++ b/doc/src/sgml/release-12.sgml
@@ -832,29 +832,6 @@ Author: Tom Lane 
       
 
-
-       
-        Add support function capability to improve optimizer estimates
-        for functions (Tom Lane)
-       
-
-       
-        This allows extensions to create planner support functions that
-        can provide function-specific selectivity, cost, and row-count
-        estimates that can depend on the function arguments.  Also, improve
-        in-core estimates for generate_series(),
-        unnest(), and functions that return boolean
-        values.
-       
-      
-
-      
-
 
@@ -2898,6 +2875,28 @@ existin
       
      
 
+      
+
+
+       
+        Add support function capability to improve optimizer estimates,
+        inlining, and indexing for functions (Tom Lane)
+       
+
+       
+        This allows extensions to create planner support functions that
+        can provide function-specific selectivity, cost, and row-count
+        estimates that can depend on the function's arguments.  Support
+        functions can also supply simplified representations and index
+        conditions, greatly expanding optimization possibilities.
+       
+      
+