Corrected grammar in explanation

I changed the comment to explain the working of the loop from past tense to present tense. 

You can see other comments which are in present tense "// runs if condition is false" but comments in other loops are in past tense "//Condition was true. Code in this block will run.". 

Minor but completes the doc.

2-js-basics/3-making-decisions/README.md

@@ -45,7 +45,7 @@ The if statement will run code in between its blocks if the condition is true.
 
 ```javascript
 if (condition){
-    //Condition was true. Code in this block will run.
+    //Condition is true. Code in this block will run.
 }
 ```
 
@@ -56,7 +56,7 @@ let currentMoney;
 let laptopPrice;
 
 if (currentMoney >= laptopPrice){
-    //Condition was true. Code in this block will run.
+    //Condition is true. Code in this block will run.
     console.log("Getting a new laptop!");
 }
 ```
@@ -70,11 +70,11 @@ let currentMoney;
 let laptopPrice;
 
 if (currentMoney >= laptopPrice){
-    //Condition was true. Code in this block will run.
+    //Condition is true. Code in this block will run.
     console.log("Getting a new laptop!");
 }
 else{
-    //Condition was false. Code in this block will run.
+    //Condition is false. Code in this block will run.
     console.log("Can't afford a new laptop, yet!");
 }
 ```
@@ -101,11 +101,11 @@ let laptopPrice;
 let laptopDiscountPrice = laptopPrice - (laptopPrice * .20) //Laptop price at 20 percent off
 
 if (currentMoney >= laptopPrice || currentMoney >= laptopDiscountPrice){
-    //Condition was true. Code in this block will run.
+    //Condition is true. Code in this block will run.
     console.log("Getting a new laptop!");
 }
 else {
-    //Condition was true. Code in this block will run.
+    //Condition is true. Code in this block will run.
     console.log("Can't afford a new laptop, yet!");
 }
 ```