Isogram approaches spelling fix (#1586)

* Create config.json

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* Create config.json

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* Update main.rs

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* Update main.rs

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* Update main.rs

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* Update introduction.md

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* Update main.rs

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* Update exercises/practice/isogram/.approaches/bitfield-func/snippet.txt

Co-authored-by: Erik Schierboom <[email protected]>

* Update exercises/practice/isogram/.approaches/filter-all/content.md

Co-authored-by: Erik Schierboom <[email protected]>

* Rename exercises/practice/isogram/.approaches/bitfield-func/content.md to exercises/practice/isogram/.approaches/bitfield-functionally/content.md

* Rename exercises/practice/isogram/.approaches/bitfield-func/snippet.txt to exercises/practice/isogram/.approaches/bitfield-functionally/snippet.txt

* Update config.json

* Update introduction.md

* Update content.md

* Update content.md

Co-authored-by: Erik Schierboom <[email protected]>

Author: bobahop

exercises/practice/isogram/.approaches/bitfield-functionally/content.md

@@ -81,7 +81,7 @@ pub fn check_bits(candidate: &str) -> bool {
 }
 ```
 
-In benchmarking, this approach was slightly slower, but its style may be prefered.
+In benchmarking, this approach was slightly slower, but its style may be preferred.
 
 [ascii]: https://www.asciitable.com/
 [const]: https://doc.rust-lang.org/std/keyword.const.html