Fix misspellings of GB.

doc/src/sgml/release.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.486 2006/11/25 07:03:57 neilc Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release.sgml,v 1.487 2006/11/25 22:55:59 petere Exp $ -->
 <!--
 
 Typical markup:
@@ -12078,7 +12078,7 @@ On some platforms, building with -fstrict-aliasing causes bugs.
 </para></listitem>
 <listitem><para>Make pg_restore handle 64-bit off_t correctly</para>
 <para>
-This bug prevented proper restoration from archive files exceeding 4Gb.
+This bug prevented proper restoration from archive files exceeding 4 GB.
 </para></listitem>
 <listitem><para>Make contrib/dblink not assume that local and remote type OIDs
 match (Joe)</para></listitem>

doc/src/sgml/storage.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.12 2006/11/25 22:44:48 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.13 2006/11/25 22:55:59 petere Exp $ -->
 
 <chapter id="storage">
 
@@ -138,7 +138,7 @@ Avoid assuming that filenode and table OID are the same.
 </caution>
 
 <para>
-When a table or index exceeds 1Gb, it is divided into gigabyte-sized
+When a table or index exceeds 1 GB, it is divided into gigabyte-sized
 <firstterm>segments</>.  The first segment's file name is the same as the
 filenode; subsequent segments are named filenode.1, filenode.2, etc.
 This arrangement avoids problems on platforms that have file size limitations.
@@ -212,7 +212,7 @@ value, but in some cases more efficient approaches are possible.)
 <para>
 <acronym>TOAST</> usurps the high-order two bits of the varlena length word,
 thereby limiting the logical size of any value of a <acronym>TOAST</>-able
-data type to 1Gb (2<superscript>30</> - 1 bytes).  When both bits are zero,
+data type to 1 GB (2<superscript>30</> - 1 bytes).  When both bits are zero,
 the value is an ordinary un-<acronym>TOAST</>ed value of the data type.  One
 of these bits, if set, indicates that the value has been compressed and must
 be decompressed before use.  The other bit, if set, indicates that the value