3 Updates to Improve Readability in Face-X/Awesome-face-operations/Readme.md

[christianmckinnon]

Is your documentation request related to a problem? Please describe.
There are 3 related issues I would like to address within the Face-X/Awesome-face-operations/Readme.md file:

The first is an unclosed </h1> tag at the end of line 36 (I have classified this as a Documentation issue as the unclosed tag does not cause the ReadMe to render improperly).

I also noticed two spelling inconsistencies that could be quickly remedied to improve the documentation on this page.

Describe the documentation you want to improved
1.) As there is no opening <h1> tag, the closing </h1> tag should simply be removed to improve code correctness.

2.) On line 36 of the file, the header, "Image Segmentation Using Color space and Opencv", could be changed to "Image Segmentation Using Color space and OpenCV", which is consistent with the spelling on line 27: "Pencil Sketch In Python Using OpenCV." This the standard abbreviated acronym of the Open Computer Vision Library's official spelling.

3.) On line 193, the second-level header "## Piplines", is spelled incorrectly, and can be updated to "## Pipelines" to improve clarity for contributors.

Additional context
Thank you so much for reading, and I would be happy to submit a pull request to remedy this issue, so please feel free to assign the issue to me!

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