doc: Summarize PR changes

Merge PRs 127, 126, 125, 124 and 91. Document some of the most relevant
changes.

Signed-off-by: Maciej Wieczor-Retman <[email protected]>

Author: maciejwieczorretman

doc/changes.src

@@ -21,6 +21,9 @@ It is the production version of NASM since 2025.
    no output would be generated in either case, assembly would fail if
    evaluating the expression triggered an error.
 
+\b Fix encoding of TCVTROWPS2PHL, correct multiple AVX512-BF16
+   instructions' operand formats and typoed mnemonics.
+
 
 \S{cl-3.00} Version 3.00