doc: Fix description of \copy for psql

The WHERE clause introduced by 31f3817 was not described.  While on it,
split the grammar of \copy FROM and TO into two distinct parts for
clarity as they support different set of options.

Author: Vignesh C
Discussion: https://postgr.es/m/CALDaNm3zWr=OmxeNqOqfT=uZTSdam_j-gkX94CL8eTNfgUtf6A@mail.gmail.com
Backpatch-through: 12

diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index 42e862cf179fc9f5aa39f4b99b6a58a2a8431d45..13179e845da7047a55b93b5dfdf527be853b5968 100644 (file)
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -982,9 +982,15 @@ testdb=>
       
 
       
+        \copy { table [ ( column_list ) ] }
+        from
+        { 'filename' | program 'command' | stdin | pstdin }
+        [ [ with ] ( option [, ...] ) ]
+        [ where condition ]
+
         \copy { table [ ( column_list ) ] | ( query ) }
-        { from | to }
-        { 'filename' | program 'command' | stdin | stdout | pstdin | pstdout }
+        to
+        { 'filename' | program 'command' | stdout | pstdout }
         [ [ with ] ( option [, ...] ) ]