Zcmp extension: additional fix to cm.pushfp instruction description, removing explanation about spimm

Signed-off-by: Albert Yosher <[email protected]>

Author: ayosher

arch/inst/Zcmp/cm.push.yaml

@@ -7,9 +7,7 @@ long_name: Create function call stack frame
 description: |
   Create stack frame: store `ra` and 0 to 12 saved registers to the stack frame, optionally allocate additional stack space.
   This instruction pushes (stores) the registers in `reg_list` to the memory below the stack pointer,
-  and then creates the stack frame by decrementing the stack pointer by `stack_adj`,
-  including any additional stack space requested by the value of `spimm`.
-  The `spimm` could be 0, 1, 2 or 3 corresponding to additional stack allocated size of 0, 16, 32 or 48 bytes.
+  and then creates the stack frame by decrementing the stack pointer by `stack_adj`.
 
   Restrictions on stack_adj: