Fix GovernorTimelockCompound and TESTING.md grammar (#5356)

contracts/governance/extensions/GovernorTimelockCompound.sol

@@ -10,7 +10,7 @@ import {SafeCast} from "../../utils/math/SafeCast.sol";
 
 /**
  * @dev Extension of {Governor} that binds the execution process to a Compound Timelock. This adds a delay, enforced by
- * the external timelock to all successful proposal (in addition to the voting duration). The {Governor} needs to be
+ * the external timelock to all successful proposals (in addition to the voting duration). The {Governor} needs to be
  * the admin of the timelock for any operation to be performed. A public, unrestricted,
  * {GovernorTimelockCompound-__acceptAdmin} is available to accept ownership of the timelock.
  *

test/TESTING.md

@@ -1,3 +1,3 @@
 ## Testing
 
-Unit test are critical to OpenZeppelin Contracts. They help ensure code quality and mitigate against security vulnerabilities. The directory structure within the `/test` directory corresponds to the `/contracts` directory.
+Unit tests are critical to OpenZeppelin Contracts. They help ensure code quality and mitigate against security vulnerabilities. The directory structure within the `/test` directory corresponds to the `/contracts` directory.