Modify PeterG's internals documentation per Monty. Added

more detailed explanation of record header and column 
storage.

BitKeeper/etc/logging_ok

@@ -67,6 +67,7 @@ paul@teton.kitebird.com
 pem@mysql.com
 peter@linux.local
 peter@mysql.com
+peterg@mysql.com
 pgulutzan@linux.local
 ram@mysql.r18.ru
 ram@ram.(none)

Docs/internals.texi

@@ -1994,7 +1994,7 @@ When you say:
 @*
 
 MySQL creates files named Table1.MYD ("MySQL Data"), Table1.MYI
-("MySQL Index"), and Table1.FRM ("Format"). These files will be in the
+("MySQL Index"), and Table1.frm ("Format"). These files will be in the
 directory: @*
 /<datadir>/<database>/
 @*
@@ -2030,6 +2030,12 @@ The minimal record header is a set of flags:
 @end table
 @*
 
+The length of the record header is thus:@*
+(1 + number of NULL columns + 7) / 8 bytes@*
+After the header, all columns are stored in 
+the order that they were created, which is the 
+same order that you would get from SHOW COLUMNS.
+
 Here's an example. Suppose you say:
 @*