Correct capitalization of 'atbash' to 'Atbash'

[tasxatzial]

No description provided.

[BNAndras]

problem-specifications/exercises/affine-cipher/description.md

Line 7 in a0679b3

Although all monoalphabetic ciphers are weak, the affine cipher is much stronger than the atbash cipher, because it has many more keys.

includes another lowercased Atbash reference.

[BNAndras]

Also, if it doesn't cause additional churn for tracks with test generators, the comments in atbash-cipher tests.toml also use the lowercased Atbash.

[tasxatzial]

So far 'Atbash' is incorrectly capitalized in:

problem-specifications/exercises/affine-cipher/description.md

Line 7 in a0679b3

Although all monoalphabetic ciphers are weak, the affine cipher is much stronger than the atbash cipher, because it has many more keys.

problem-specifications/exercises/atbash-cipher/metadata.toml

Line 2 in a0679b3

blurb = "Create an implementation of the atbash cipher, an ancient encryption system created in the Middle East."

problem-specifications/exercises/atbash-cipher/canonical-data.json

Line 5 in a0679b3

"* Encoding from English to atbash cipher",

problem-specifications/exercises/atbash-cipher/canonical-data.json

Line 6 in a0679b3

"* Decoding from atbash cipher to all-lowercase-mashed-together English"

I'll update those too, if needed. I just need to know which ones.

Edit: I guess the affine-cipher instructions need to be fixed for sure.

[IsaacG]

I think it would be good to update them all to be consistent.