arm64/sme: Fix SVE/SME typo in ABI documentation

Fix a cut'n'paste error.
Reported-by: Luis Machado <luis.machado@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220608115915.251870-1-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

Documentation/arm64/sme.rst

@@ -371,7 +371,7 @@ The regset data starts with struct user_za_header, containing:
 Appendix A.  SME programmer's model (informative)
 =================================================
 
-This section provides a minimal description of the additions made by SVE to the
+This section provides a minimal description of the additions made by SME to the
 ARMv8-A programmer's model that are relevant to this document.
 
 Note: This section is for information only and not intended to be complete or