EF_RISCV_N32: Add some supplement descriptions

 - Add RV64GQ systems also could use ILP32* ABIs.
 - Correct C/{Cpp} type sizes and alignments descriptions.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Liao Shihua <shihua@iscas.ac.cn>

riscv-cc.adoc

@@ -516,6 +516,7 @@ on RV64G:: <<abi-lp64d,LP64D>>
 NOTE: Although RV64GQ systems can technically use <<abi-lp64q,LP64Q>>, it is
 strongly recommended to use LP64D on general-purpose RV64GQ systems for
 compatibility with standard RV64G software.
+RV64GQ systems also could use ILP32* ABIs.
 
 == Calling Convention for System Calls
 
@@ -533,7 +534,7 @@ There are two conventions for C/{Cpp} type sizes and alignments.
 ILP32, ILP32F, ILP32D, and ILP32E:: Use the following type sizes and
 alignments (based on the ILP32 convention):
 +
-.C/{Cpp} type sizes and alignments for RV32
+.C/{Cpp} type sizes and alignments for ILP32
 [cols="4,>2,>3,4"]
 [width=60%]
 |===
@@ -559,7 +560,7 @@ alignments (based on the ILP32 convention):
 LP64, LP64F, LP64D, and LP64Q:: Use the following type sizes and
 alignments (based on the LP64 convention):
 +
-.C/{Cpp} type sizes and alignments for RV64
+.C/{Cpp} type sizes and alignments for LP64
 [cols="4,>2,>3,4"]
 [width=60%]
 |===