Fixed major typos

Author: tejas-mn

web/src/pages/concepts/primitives.mdx

@@ -94,7 +94,7 @@ If the number is floating, `parseFloat` can be used. `parseInt` and `parseFloat`
 
 ### 4. Write a code to operate on integer numbers outside the range of numbers in JavaScript
 
-- `BigInt` is a datatype in JavaScript which facilitates the mathematical opertions on huge value of integer number
+- `BigInt` is a datatype in JavaScript which facilitates the mathematical operations on huge value of integer number
 - It is represented by a suffix 'n' for number value
 
 ```js copy