fix javascript method descriptions

Author: Anandhu936

README.MD

@@ -265,15 +265,19 @@ css(css, value) {
 ```
 
 ##### data
+
 Store arbitrary data associated with the matched elements.
+
 ```js
 data(name, value) {
   return this.attr(`data-${name}`, value);
 }
 ```
 
 ##### each
+
 Iterate over a jQuery object, executing a function for each matched element.
+
 ```js
 each(func) {
     if (!this.elements) {
@@ -409,7 +413,9 @@ is(el) {
 ```
 
 ##### next
+
 Get the immediately following sibling of each element in the set of matched elements. If a selector is provided, it retrieves the next sibling only if it matches that selector.
+
 ```js
 next() {
   if (!this.element) {