releasenote.md: cleanup and fixes

[esyr-rh]

This patch set does some cleanup to releasenote.md and fixes various inaccuracies in recent release notes:

• fix up white space usage (eliminate U+0080 usage and most of the trailing spaces);
• remove excess "Release Notes" first-level headers;
• sort the entries in microcode-20230808 tables;
• fix incorrect platform mask for RPL-H/P/U (0xc0 instead of 0x07) in microcode-20230214 and microcode-20230512 release notes;
• fix incorrect stepping for RPL-S (B0 insteas of S0);
• add missing RPL-U (06-ba-03/e0) entry in the "New Platforms" section of microcode-20230808 release notes;
• remove the duplicating 06-ba-03/e0 entry in the "Updated Platforms" section microcode-20230808 release notes;
• fix old revisions for 06-8e-09/10 and 06-55-04/b7 entries in microcode-20230808 release notes;
• add old revisions for 06-be-00/11, 06-ba-02/e0, and 06-ba-03/e0 entries in the "Updated Platforms" section of microcode-20230808 release notes.