gas/doc/riscv: Fixed typo of `.insn cj' format

gas/
	* doc/c-riscv.texi: Fixed typo of `.insn cj' format.
diff --git a/gas/doc/c-riscv.texi b/gas/doc/c-riscv.texi
index 24df83b..d396669 100644
--- a/gas/doc/c-riscv.texi
+++ b/gas/doc/c-riscv.texi
@@ -673,7 +673,7 @@
 15      13             10     7                  2         0
 @end verbatim
 
-@item CJ type: .insn cj opcode2, symbol
+@item CJ type: .insn cj opcode2, func3, symbol
 @verbatim
 +-------+-------------------------------+---------+
 | func3 | simm11[11|4|9:8|10|6|7|3:1|5] | opcode2 |