fix: minor typos

[tudorpintea999]

Hello
I fixed some typos in the docs.
Hope it helps.
Br,
Tudor.

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This change is 

[orizi]

there's a CI for typos now - feel free to rebase if your suggestions were not fixed by it just yet.

Reviewable status: 0 of 7 files reviewed, all discussions resolved

[orizi]

Reviewed 2 of 7 files at r1, all commit messages.
Reviewable status: 2 of 7 files reviewed, 5 unresolved discussions (waiting on @tudorpintea999)

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corelib/src/starknet/testing.cairo line 6 at r1 (raw file):

use core::traits::Into;

// A general cheatcode function used to simplify the implementation of Starknet testing functions.

revert

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docs/reference/src/components/cairo/modules/appendices/pages/contribution-guidelines.adoc line 12 at r1 (raw file):

You've found a bug in the source code, a mistake in the documentation or maybe you'd like a new
feature? Take a look at the link:https://github.com/starkware-libs/cairo/discussions[GitHub Discussions] to see if it's already being discussed.  You can

revert

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docs/reference/src/components/cairo/modules/getting_started/pages/prerequisites.adoc line 29 at r1 (raw file):

1 . Download and install link:https://code.visualstudio.com/[VSCode].

2 . Follow the instructions in the link:https://github.com/starkware-libs/cairo/blob/main/vscode-cairo/README.md[vscode-cairo].

Suggestion:

1 . Download and install link:https://code.visualstudio.com/[VSCode].

2 . Follow the instructions in link:https://github.com/starkware-libs/cairo/blob/main/vscode-cairo/README.md[vscode-cairo].

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docs/reference/src/components/cairo/modules/ROOT/pages/how-to-contribute.adoc line 51 at r1 (raw file):

- We encourage developers to ask and answer questions on https://stackoverflow.com/questions/tagged/cairo-lang[stackoverflow].
- Contact options listed on the link:https://github.com/starkware-libs[this GitHub profile]

revert

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docs/reference/src/components/cairo/modules/ROOT/pages/index.adoc line 19 at r1 (raw file):

more about Sierra link:https://medium.com/starkware/cairo-1-0-aa96eefb19a0[here].

If you are looking for Cairo 0 documentation, please see the link:https://www.cairo-lang.org/docs/0.12.0/hello_cairo/index.html[here].

revert

[orizi]

Reviewed 3 of 7 files at r1, 1 of 1 files at r2, 1 of 1 files at r3, 1 of 1 files at r4.
Reviewable status: 6 of 7 files reviewed, 3 unresolved discussions (waiting on @tudorpintea999)

[orizi]

Reviewed 1 of 1 files at r5, 1 of 1 files at r6, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @tudorpintea999)

[orizi]

Reviewed 1 of 1 files at r7, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @tudorpintea999)