Add id's to various elements in protocol.sgml

Applied patch to 'doc/src/sgml/amcheck.sgml' cleanly.
Applied patch to 'doc/src/sgml/arch-dev.sgml' with conflicts.
Applied patch to 'doc/src/sgml/auth-delay.sgml' cleanly.
Applied patch to 'doc/src/sgml/auto-explain.sgml' with conflicts.
Applied patch to 'doc/src/sgml/basic-archive.sgml' cleanly.
Applied patch to 'doc/src/sgml/bloom.sgml' cleanly.
Applied patch to 'doc/src/sgml/btree-gin.sgml' cleanly.
Applied patch to 'doc/src/sgml/btree-gist.sgml' with conflicts.
Applied patch to 'doc/src/sgml/charset.sgml' with conflicts.
Applied patch to 'doc/src/sgml/citext.sgml' cleanly.
Applied patch to 'doc/src/sgml/config.sgml' with conflicts.
Applied patch to 'doc/src/sgml/contrib-spi.sgml' with conflicts.
Applied patch to 'doc/src/sgml/cube.sgml' cleanly.
Applied patch to 'doc/src/sgml/datatype.sgml' cleanly.
Applied patch to 'doc/src/sgml/ddl.sgml' with conflicts.
Applied patch to 'doc/src/sgml/dict-int.sgml' cleanly.
Applied patch to 'doc/src/sgml/dict-xsyn.sgml' cleanly.
Applied patch to 'doc/src/sgml/docguide.sgml' with conflicts.
Applied patch to 'doc/src/sgml/earthdistance.sgml' cleanly.
Applied patch to 'doc/src/sgml/ecpg.sgml' with conflicts.
Applied patch to 'doc/src/sgml/extend.sgml' with conflicts.
Applied patch to 'doc/src/sgml/features.sgml' cleanly.
error: doc/src/sgml/func.sgml: does not exist in index
Applied patch to 'doc/src/sgml/fuzzystrmatch.sgml' with conflicts.
Applied patch to 'doc/src/sgml/geqo.sgml' cleanly.
Applied patch to 'doc/src/sgml/history.sgml' cleanly.
Applied patch to 'doc/src/sgml/hstore.sgml' cleanly.
error: doc/src/sgml/install-windows.sgml: does not exist in index
Applied patch to 'doc/src/sgml/installation.sgml' with conflicts.
Applied patch to 'doc/src/sgml/intagg.sgml' with conflicts.
Applied patch to 'doc/src/sgml/intarray.sgml' cleanly.
Applied patch to 'doc/src/sgml/isn.sgml' cleanly.
Applied patch to 'doc/src/sgml/jit.sgml' cleanly.
Applied patch to 'doc/src/sgml/json.sgml' cleanly.
Applied patch to 'doc/src/sgml/libpq.sgml' cleanly.
Applied patch to 'doc/src/sgml/lo.sgml' cleanly.
Applied patch to 'doc/src/sgml/logicaldecoding.sgml' cleanly.
Applied patch to 'doc/src/sgml/ltree.sgml' cleanly.
Applied patch to 'doc/src/sgml/nls.sgml' cleanly.
error: doc/src/sgml/oldsnapshot.sgml: does not exist in index
Applied patch to 'doc/src/sgml/pageinspect.sgml' cleanly.
Applied patch to 'doc/src/sgml/perform.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgbuffercache.sgml' with conflicts.
Applied patch to 'doc/src/sgml/pgcrypto.sgml' with conflicts.
Applied patch to 'doc/src/sgml/pgfreespacemap.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgprewarm.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgrowlocks.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgstatstatements.sgml' with conflicts.
Applied patch to 'doc/src/sgml/pgstattuple.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgsurgery.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgtrgm.sgml' cleanly.
Applied patch to 'doc/src/sgml/pgvisibility.sgml' cleanly.
Applied patch to 'doc/src/sgml/plpgsql.sgml' with conflicts.
Applied patch to 'doc/src/sgml/plpython.sgml' cleanly.
Applied patch to 'doc/src/sgml/postgres-fdw.sgml' with conflicts.
Applied patch to 'doc/src/sgml/problems.sgml' cleanly.
Applied patch to 'doc/src/sgml/protocol.sgml' with conflicts.
Applied patch to 'doc/src/sgml/queries.sgml' cleanly.
Applied patch to 'doc/src/sgml/ref/alter_table.sgml' with conflicts.
Applied patch to 'doc/src/sgml/ref/commit.sgml' cleanly.
Applied patch to 'doc/src/sgml/ref/create_table.sgml' with conflicts.
Applied patch to 'doc/src/sgml/ref/initdb.sgml' with conflicts.
Applied patch to 'doc/src/sgml/ref/pgbench.sgml' with conflicts.
Applied patch to 'doc/src/sgml/ref/psql-ref.sgml' with conflicts.
Applied patch to 'doc/src/sgml/ref/rollback.sgml' cleanly.
Applied patch to 'doc/src/sgml/regress.sgml' with conflicts.
Applied patch to 'doc/src/sgml/rowtypes.sgml' cleanly.
Applied patch to 'doc/src/sgml/rules.sgml' cleanly.
Applied patch to 'doc/src/sgml/runtime.sgml' cleanly.
Applied patch to 'doc/src/sgml/seg.sgml' cleanly.
Applied patch to 'doc/src/sgml/sepgsql.sgml' cleanly.
Applied patch to 'doc/src/sgml/sources.sgml' cleanly.
Applied patch to 'doc/src/sgml/sslinfo.sgml' cleanly.
Applied patch to 'doc/src/sgml/stylesheet-html-common.xsl' with conflicts.
Applied patch to 'doc/src/sgml/stylesheet.css' with conflicts.
Applied patch to 'doc/src/sgml/tablefunc.sgml' with conflicts.
Applied patch to 'doc/src/sgml/tsm-system-rows.sgml' cleanly.
Applied patch to 'doc/src/sgml/tsm-system-time.sgml' cleanly.
Applied patch to 'doc/src/sgml/unaccent.sgml' cleanly.
Applied patch to 'doc/src/sgml/uuid-ossp.sgml' cleanly.
Applied patch to 'doc/src/sgml/xfunc.sgml' with conflicts.
Applied patch to 'doc/src/sgml/xml2.sgml' with conflicts.
Applied patch to 'doc/src/sgml/xoper.sgml' cleanly.