Remove c1 and c2 unreferenced local variable in _rot{l,r}{8,16} intrinsics reference

Author: Rageking8

docs/intrinsics/rotl8-rotl16.md

@@ -61,7 +61,7 @@ Unlike a left-shift operation, when executing a left rotation, the high-order bi
 
 int main()
 {
-    unsigned char c = 'A', c1, c2;
+    unsigned char c = 'A';
 
     for (int i = 0; i < 8; i++)
     {

docs/intrinsics/rotr8-rotr16.md

@@ -61,7 +61,7 @@ Unlike a right-shift operation, when executing a right rotation, the low-order b
 
 int main()
 {
-    unsigned char c = 'A', c1, c2;
+    unsigned char c = 'A';
 
     for (int i = 0; i < 8; i++)
     {