issue: #4427; Added the Alternate text to image tags

[sathiyaIbe]

Yeah it's my first contribution I had updated the images with missing alt : alternate text to the image tag So kindly check the changed files

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (038b306) 99.51% compared to head (4400b7f) 99.51%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4429   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files         186      186           
  Lines        3511     3511           
=======================================
  Hits         3494     3494           
  Misses         17       17           

Impacted Files	Coverage Δ
src/modules/Embed/Embed.js	100.00% <ø> (ø)

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