Bug: Typo in 'CONTRIBUTING.md'

[xjwllmsx]

Describe the bug

There is a typo in CONTRIBUTING.md.

The word joining in line 71 does not make sense in the context of the sentence and creates a redundancy issue with the following word, checking:

.github/CONTRIBUTING.md

Line 71 in 5fdc14a

If you would like to contribute to the project for the first time, please consider joining checking the [bug](https://github.com/open-sauced/open-sauced/issues?q=is%3Aissue+is%3Aopen+label%3A%22%F0%9F%90%9B+bug%22) or [good first issue](https://github.com/open-sauced/open-sauced/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) labels.

Steps to reproduce

1. Go to CONTRIBUTING.md
2. Scroll down to Line 71 to see the error

[xjwllmsx]

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