Typos found in the documentation files (#1631)

* Typo Update README.md

The error is in the verb "use," which should be "uses" to agree with the subject "Arbitrum."

* Typo Update README.md

The error is in the word "proposa," which should be "proposal."

src/validations/arbitrum/README.md

@@ -7,7 +7,7 @@
 
 This validation module check the number of basis points (bps, i.e. 0.01%) of vote a delegate control, which is used to enforce the 0.01% snapshot proposer requirement specified in [The Constitution of the Arbitrum DAO](https://docs.arbitrum.foundation/dao-constitution).
 
-Arbitrum use an EXCLUDE_ADDRESS (0x00000000000000000000000000000000000A4B86) to mark non-votable tokens, tokens delegated to the EXCLUDE_ADDRESS will be excluded from votable supply.
+Arbitrum uses an EXCLUDE_ADDRESS (0x00000000000000000000000000000000000A4B86) to mark non-votable tokens, tokens delegated to the EXCLUDE_ADDRESS will be excluded from votable supply.
 
 You should use this validation module with erc20-votes strategy configured with the same token address and decimals.
 

src/validations/passport-gated/README.md

@@ -63,7 +63,7 @@ The original code utilized the Passport SDK to check if the user has a valid pas
 
 ### September 21, 2023
 
-Code is fully integrated with Passport API. In order to evaluate if an address is eligible for creating/voting on a proposa, It checks for passport stamp collection and minimum score using the `Unique Humanity` scoring mechanism, however it could be upgraded in the future to support other scoring algorithms.
+Code is fully integrated with Passport API. In order to evaluate if an address is eligible for creating/voting on a proposal, It checks for passport stamp collection and minimum score using the `Unique Humanity` scoring mechanism, however it could be upgraded in the future to support other scoring algorithms.
 
 Unit tests now support multiple example Passports to evaluate different validation scenarios.