Added documentation for Armstrong Number + Typo fix in Trie.md in /en

[SpiderMath]

Description

This pull request adds documentation for the algorithm for checking if a number is an Armstrong Number, the link to the entry is here. I plan to add further documentation for other entries but I am starting with low hanging fruit for now.

Checklist

• A description of the changes in this PR is mentioned above.
• All the new and existing checks pass.
• No plagiarized, duplicated, or repetitive documentation that has been directly copied from another source.
• If it's a new explanation, it contains solid, understandable, and accessible information.
• I have read the whole contributing guidelines and agree to the Code of Conduct.

Screenshots (if any)

None in this case

Note to reviewers

I'm rather unsure about the quality of my pseudocode, I feel it may be too spammy with comments or code-like to be pseudocode. Please review that bit. And the codespell action fails due to a typo in a completely different file I didn't touch, hence I haven't touched it in this case. I corrected the typo in question, in /en/Data Structures/Tries/trie.md

[SpiderMath]

Considering that the codespell is failing due to trie.md, I fixed it (revelant to relevant) and I've edited the title accordingly.

[SpiderMath]

@vbrazo @Panquesito7 @appgurueu
Could I get some sort of response? This has been sitting in here for the past month, and I really wish to contribute the docs to be more complete! I don't think making a bunch of PRs would be helpful for y'all though, hence I was thinking about going one-by-one.

[github-actions]

This pull request has been automatically marked as abandoned because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

Please ping one of the maintainers once you commit the changes requested or make improvements on the code. If this is not the case and you need some help, feel free to ask for help in our Gitter channel. Thank you for your contributions!

[SpiderMath]

Well... that was strange.
@Panquesito7 @vbrazo @appgurueu, sorry to bother you again but some updates would be nice. Thanks.

[SpiderMath]

So I guess we're abandoning this one then?