doc: improve wording of the need for analyze of exp. indexes

This is a followup commit on 3370207986.

Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/20201112211143[email protected]

Backpatch-through: 9.5

diff --git a/doc/src/sgml/ref/create_index.sgml b/doc/src/sgml/ref/create_index.sgml
index ab85b1aac8d5798904bdb45a1f723f4dfedb1139..c5417bf4b88a6de131cb6093c590df6282e89015 100644 (file)
--- a/doc/src/sgml/ref/create_index.sgml
+++ b/doc/src/sgml/ref/create_index.sgml
@@ -711,7 +711,7 @@ Indexes:
    For new expression indexes, it is necessary to run 
    linkend="sql-analyze">ANALYZE or wait for
    the autovacuum daemon to analyze
-   the table to generate statistics about new expression indexes.
+   the table to generate statistics for these indexes.