libstdc++: Mention recent libgcc_s symbol versions in manual

GCC_11.0 is an aarch64-specific outlier.

libstdc++-v3/ChangeLog:

	* doc/xml/manual/abi.xml (abi.versioning.history): Add
	GCC_7.0.0, GCC_9.0.0, GCC_11.0, GCC_12.0.0, GCC_13.0.0 for
	libgcc_s.