'.inst' in inline-assembly changed to '.insn'

Author: CyoeeA9e

src/inline-assembly.md

@@ -569,7 +569,7 @@ The following directives are guaranteed to be supported by the assembler:
 - `.float`
 - `.global`
 - `.globl`
-- `.inst`
+- `.insn`
 - `.lcomm`
 - `.long`
 - `.octa`