fix some example code issues in https://docs.circom.io/ (#324)

Co-authored-by: yushihang <shihang.yu@hsbc.com>

Author: yushihang

mkdocs/docs/circom-language/code-quality/inspect.md

@@ -9,9 +9,9 @@ When using --inspect option, the compiler searches for signals that may be under
 1) The compiler throws a warning if a signal defined in a template does not appear in any constraint of such template for the given instantiation.
 
 ```
-template B(n) {
+template B() {
   signal input in;
-  signal input out;
+  signal output out;
   out <== in + 1;
 }
 

mkdocs/docs/circom-language/templates-and-components.md

@@ -117,6 +117,8 @@ template B(N){
   else{
      a = A(0);
   }
+  a.in <== 1;
+  a.out ==> out;
 }
 
 component main = B(1);
@@ -171,7 +173,7 @@ component comp = parallel NameTemplate(...){...}
 A real example of use case is the following piece of code from the rollup code:
 ```
 component rollupTx[nTx];
-for (i = 0; i < nTx; i++) {
+for (var i = 0; i < nTx; i++) {
         rollupTx[i] = parallel RollupTx(nLevels, maxFeeTx);
 }
 ```