Fix: minor typos (#111)

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## Pull Request type

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Please check the type of change your PR introduces:

- [ ] Bugfix
- [ ] Feature
- [ ] Code style update (formatting, renaming)
- [ ] Refactoring (no functional changes, no API changes)
- [ ] Build-related changes
- [ ] Documentation content changes
- [x] Typos

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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alexandria/searching/README.md

@@ -2,4 +2,4 @@
 
 ## [Binary search](./src/binary_search.cairo)
 
-The binary search algorithm is a simple search in an ordered array-like compound. It start by comparing the value we are looking for to the middle of the array. If it's not a match, the function calls itself recursively on the right or left half of the array until is does(n't) find the value in the array.
+The binary search algorithm is a simple search in an ordered array-like compound. It starts by comparing the value we are looking for to the middle of the array. If it's not a match, the function calls itself recursively on the right or left half of the array until it does(n't) find the value in the array.