[Docs][RISCV] Move Zilsd to 'Supported' status. NFC (#140757)

Author: topperc

llvm/docs/RISCVUsage.rst

@@ -209,7 +209,7 @@ on support follow.
      ``Zihintntl``     Supported
      ``Zihintpause``   Assembly Support
      ``Zihpm``         (`See Note <#riscv-i2p1-note>`__)
-     ``Zilsd``         Assembly Support
+     ``Zilsd``         Supported
      ``Zimop``         Supported
      ``Zkn``           Supported
      ``Zknd``          Supported (`See note <#riscv-scalar-crypto-note2>`__)