arm64/booting: Add missing colon to FA64 entry

The booting documentation for FEAT_SME_FA64 is missing a colon that is
normally present, add it.

Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: broonie

Documentation/arm64/booting.rst

@@ -348,7 +348,7 @@ Before jumping into the kernel, the following conditions must be met:
 
     - HWFGWTR_EL2.nSMPRI_EL1 (bit 54) must be initialised to 0b01.
 
-  For CPUs with the Scalable Matrix Extension FA64 feature (FEAT_SME_FA64)
+  For CPUs with the Scalable Matrix Extension FA64 feature (FEAT_SME_FA64):
 
   - If EL3 is present: