Update README.md spacing

Signed-off-by: Zoraiz Qureshi <[email protected]>

Author: ZoraizQ

README.md

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 [![View <Extension Points Examples> on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/174625-extension-points-examples)
 
-<img src="./screenshots/preview.png" width=300 height=200 alt="preview">
+<img src="./screenshots/preview.png" width=300 height=200 alt="preview"/>
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 You can extend various functionalities of the MATLAB&reg; desktop using Extension Points. For example, you can add custom items to the Quick Access Toolbar or change the icon or label for a file type in the Files panel.
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 #### Add an Item to the Quick Access Toolbar
 `mw.desktop.quickAccess` - Add a new button to the Quick Access Toolbar that triggers a MATLAB callback function.
 
-<img src="./screenshots/demo-quickAccess.png" width=450 height=75 alt="preview">
+<img src="./screenshots/demo-quickAccess.png" width=450 height=75 alt="preview"/>
 
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 #### Add New Displayed Roots to the Address Bar
 `mw.desktop.addressBar.displayedRoots` - Customize the list of displayed roots in the Address Bar.
 
-<img src="./screenshots/demo-addressBarDisplayedRoots.png" width=450 height=82 alt="preview">
+<img src="./screenshots/demo-addressBarDisplayedRoots.png" width=450 height=82 alt="preview"/>
 
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@@ -33,15 +33,15 @@ Includes examples for the following Extension Points. These customizations are e
 
 `mw.fileTypes.labels` — Specify the label that displays for a file type in the Files panel, including the Type column and File Preview.
 
-<img src="./screenshots/demo-icons-labels.png" width=450 height=82 alt="preview">
+<img src="./screenshots/demo-icons-labels.png" width=450 height=82 alt="preview"/>
 
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 #### Custom File Name Validation
 `mw.fileTypes.fileNameValidation` — Add filename validation for a file type to ensure the filename is valid when a file of that type / group is created or renamed.
 
-<img src="./screenshots/demo-filenameValidation.png" width=450 height=60 alt="preview">
+<img src="./screenshots/demo-filenameValidation.png" width=450 height=60 alt="preview"/>
 
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