Fix for loop snippet

Author: chenglou

pages/docs/manual/latest/control-flow.mdx

@@ -112,16 +112,14 @@ for(var i = startValueInclusive; i <= endValueInclusive; ++i){
 <CodeTab labels={["ReScript", "JS Output"]}>
 
 ```res example
-// prints: 1 2 3
+// prints: 1 2 3, one per line
 for x in 1 to 3 {
   Js.log(x)
-  Js.log(" ")
 }
 ```
 ```js
 for(var x = 1; x <= 3; ++x){
   console.log(x);
-  console.log(" ");
 }
 ```
 
@@ -147,16 +145,14 @@ for(var i = startValueInclusive; i >= endValueInclusive; --i){
 <CodeTab labels={["ReScript", "JS Output"]}>
 
 ```res example
-// prints: 3 2 1
+// prints: 3 2 1, one per line
 for x in 3 downto 1 {
   Js.log(x)
-  Js.log(" ")
 }
 ```
 ```js
 for(var x = 3; x >= 1; --x){
   console.log(x);
-  console.log(" ");
 }
 ```
 

pages/docs/manual/v8.0.0/control-flow.mdx

@@ -137,23 +137,20 @@ for(var i = startValueInclusive; i <= endValueInclusive; ++i){
 <CodeTab labels={["Reason (Old Syntax)", "ML (Older Syntax)", "JS Output"]}>
 
 ```re
-// prints: 1 2 3
+// prints: 1 2 3, one per line
 for (x in 1 to 3) {
   Js.log(x);
-  Js.log(" ");
 };
 ```
 ```ml
-(* prints: 1 2 3 *)
+(* prints: 1 2 3, one per line *)
 for x = 1 to 3 do
   Js.log x;
-  Js.log " "
 done
 ```
 ```js
 for(var x = 1; x <= 3; ++x){
   console.log(x);
-  console.log(" ");
 }
 ```
 
@@ -184,23 +181,20 @@ for(var i = startValueInclusive; i >= endValueInclusive; --i){
 <CodeTab labels={["Reason (Old Syntax)", "ML (Older Syntax)", "JS Output"]}>
 
 ```re
-// prints: 3 2 1
+// prints: 3 2 1, one per line
 for (x in 3 downto 1) {
   Js.log(x);
-  Js.log(" ");
 };
 ```
 ```ml
-(* prints: 3 2 1 ()
+(* prints: 3 2 1, one per line)
 for x = 3 downto 1 do
   Js.log x;
-  Js.log " "
 done
 ```
 ```js
 for(var x = 3; x >= 1; --x){
   console.log(x);
-  console.log(" ");
 }
 ```