Further code and wording tweaks in BRIN

Besides a couple of typo fixes, per David Rowley, Thom Brown, and Amit
Langote, and mentions of BRIN in the general CREATE INDEX page again per
David, this includes silencing MSVC compiler warnings (thanks Microsoft)
and an additional variable initialization per Coverity scanner.

doc/src/sgml/brin.sgml

@@ -64,7 +64,7 @@
  <title>Built-in Operator Classes</title>
 
  <para>
-  The core <productname>PostgreSQL</productname> distribution includes
+  The core <productname>PostgreSQL</productname> distribution
   includes the <acronym>BRIN</acronym> operator classes shown in 
   <xref linkend="brin-builtin-opclasses-table">.
  </para>

doc/src/sgml/ref/create_index.sgml

@@ -57,8 +57,8 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=
 
   <para>
    <productname>PostgreSQL</productname> provides the index methods
-   B-tree, hash, GiST, SP-GiST, and GIN.  Users can also define their own index
-   methods, but that is fairly complicated.
+   B-tree, hash, GiST, SP-GiST, GIN, and BRIN.  Users can also define their own
+   index methods, but that is fairly complicated.
   </para>
 
   <para>
@@ -166,7 +166,8 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=
        <para>
         The name of the index method to be used.  Choices are
         <literal>btree</literal>, <literal>hash</literal>,
-        <literal>gist</literal>, <literal>spgist</> and <literal>gin</>.
+        <literal>gist</literal>, <literal>spgist</>, <literal>gin</>, and
+        <literal>brin</>.
         The default method is <literal>btree</literal>.
        </para>
       </listitem>
@@ -492,7 +493,7 @@ Indexes:
   </caution>
 
   <para>
-   Currently, only the B-tree, GiST and GIN index methods support
+   Currently, only the B-tree, GiST, GIN, and BRIN index methods support
    multicolumn indexes. Up to 32 fields can be specified by default.
    (This limit can be altered when building
    <productname>PostgreSQL</productname>.)  Only B-tree currently

src/backend/access/brin/README

@@ -126,7 +126,7 @@ that page range is complete and new tuples belong in a new page range that
 hasn't yet been summarized.  Those insertions do not create a new index
 entry; instead, the page range remains unsummarized until later.
 
-Wehn VACUUM is run on the table, all unsummarized page ranges are
+Whenever VACUUM is run on the table, all unsummarized page ranges are
 summarized.  This action can also be invoked by the user via
 brin_summarize_new_values().  Both these procedures scan all the
 unsummarized ranges, and create a summary tuple.  Again, this includes the

src/backend/access/brin/brin.c

@@ -107,9 +107,11 @@ brininsert(PG_FUNCTION_ARGS)
 		BrinMemTuple *dtup;
 		BlockNumber heapBlk;
 		int			keyno;
-		BrinTuple  *tmptup PG_USED_FOR_ASSERTS_ONLY;
-		BrinMemTuple *tmpdtup PG_USED_FOR_ASSERTS_ONLY;
-		Size tmpsiz PG_USED_FOR_ASSERTS_ONLY;
+#ifdef USE_ASSERT_CHECKING
+		BrinTuple  *tmptup;
+		BrinMemTuple *tmpdtup;
+		Size 		tmpsiz;
+#endif
 
 		CHECK_FOR_INTERRUPTS();
 

src/backend/access/brin/brin_tuple.c

@@ -95,7 +95,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
 	BrinTuple  *rettuple;
 	int			keyno;
 	int			idxattno;
-	uint16		phony_infomask;
+	uint16		phony_infomask = 0;
 	bits8	   *phony_nullbitmap;
 	Size		len,
 				hoff,