Fix formatting issues in hooks_extension_framework.rst

[Vishwajit-Herma]

Fix the repetition of word "separation from the" in "The Framework vs Forking the Open edX Platform" sections table.

[openedx-webhooks]

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[mphilbrick211]

Hi @Vishwajit-Herma! Thank you for this contribution! Please let us know if you have any questions regarding submitting a CLA form.

[sarina]

@Vishwajit-Herma once your CLA is processed, this can merge. Please ping @mphilbrick211 with any questions regarding that. Thank you!

[Vishwajit-Herma]

Hi @Vishwajit-Herma! Thank you for this contribution! Please let us know if you have any questions regarding submitting a CLA form.

I have filled the CLA form but didn't receive email for the same. And also what to do after receiving email? @mphilbrick211