docs: wrote Signal explanation in glossary

[Jo-Shino]

Description

• Added the term semaphore "signal" compared to Circom to the glossary.

Related Issue

https://github.com/semaphore-protocol/website/issues/46

[Jo-Shino]

Hi,@cedoor @vplasencia could you check this pull request? Thank you.

[vplasencia]

Hey @Jo-Shino! Thank you so much for the definition. It looks great. I added a suggestion.

[Jo-Shino]

@vplasencia Thank you for pointing this out. I revised the text, so please check it again!

[vplasencia]

@Jo-Shino Thank you so much for updating the definition. After updating that word, everything is ready to merge. Would you like to update it? You can click the Commit suggestion button, so it is easier for you to create the commit.

[Jo-Shino]

@vplasencia I pushed commit suggestion button and updated the text. Thank you!

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[vplasencia]

Thank you so much @Jo-Shino for the contribution 🚀