Fix spelling mistakes and CI spellcheck job

test/externalTests/README.md

@@ -79,7 +79,7 @@ The above is the workflow to use when the update is straightforward and looks sa
 fine to just modify the branches directly. If this is not the case, it is recommended to first perform the
 operation on copies of these version-specific branches and test them by creating PRs on `develop` and
 `breaking` to see if tests pass. The PRs should just modify project scripts in `test/externalScripts/`
-to use the updated copies of the branches and can be discarded aferwards without being merged.
+to use the updated copies of the branches and can be discarded afterwards without being merged.
 
 #### Changes needed after a breaking release of the compiler
 When a non-backwards-compatible version becomes the most recent release, `breaking` branch

test/libevmasm/Optimiser.cpp

@@ -714,10 +714,10 @@ BOOST_AUTO_TEST_CASE(cse_keccak256_twice_same_content_noninterfering_store_in_be
 		Instruction::MSTORE, // m[12] = DUP1
 		Instruction::DUP12,
 		u256(12 + 32),
-		Instruction::MSTORE, // does not destoy memory knowledge
+		Instruction::MSTORE, // does not destroy memory knowledge
 		Instruction::DUP13,
 		u256(128 - 32),
-		Instruction::MSTORE, // does not destoy memory knowledge
+		Instruction::MSTORE, // does not destroy memory knowledge
 		u256(0x20),
 		u256(12),
 		Instruction::KECCAK256 // keccak256(m[12..(12+32)])

test/liblangutil/Scanner.cpp

@@ -329,7 +329,7 @@ BOOST_AUTO_TEST_CASE(trailing_dot_in_numbers)
 
 BOOST_AUTO_TEST_CASE(leading_underscore_decimal_is_identifier)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	CharStream stream("_1.2", "");
 	Scanner scanner(stream);
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Identifier);
@@ -339,7 +339,7 @@ BOOST_AUTO_TEST_CASE(leading_underscore_decimal_is_identifier)
 
 BOOST_AUTO_TEST_CASE(leading_underscore_decimal_after_dot_illegal)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	TestScanner scanner("1._2");
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
 	BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);
@@ -351,7 +351,7 @@ BOOST_AUTO_TEST_CASE(leading_underscore_decimal_after_dot_illegal)
 
 BOOST_AUTO_TEST_CASE(leading_underscore_exp_are_identifier)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	CharStream stream("_1e2", "");
 	Scanner scanner(stream);
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Identifier);
@@ -360,7 +360,7 @@ BOOST_AUTO_TEST_CASE(leading_underscore_exp_are_identifier)
 
 BOOST_AUTO_TEST_CASE(leading_underscore_exp_after_e_illegal)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	CharStream stream("1e_2", "");
 	Scanner scanner(stream);
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
@@ -379,7 +379,7 @@ BOOST_AUTO_TEST_CASE(leading_underscore_hex_illegal)
 
 BOOST_AUTO_TEST_CASE(fixed_number_invalid_underscore_front)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	CharStream stream("12._1234_1234", "");
 	Scanner scanner(stream);
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
@@ -388,7 +388,7 @@ BOOST_AUTO_TEST_CASE(fixed_number_invalid_underscore_front)
 
 BOOST_AUTO_TEST_CASE(number_literals_with_trailing_underscore_at_eos)
 {
-	// Actual error is cought by SyntaxChecker.
+	// Actual error is caught by SyntaxChecker.
 	TestScanner scanner("0x123_");
 	BOOST_CHECK_EQUAL(scanner.currentToken(), Token::Number);
 	BOOST_CHECK_EQUAL(scanner.next(), Token::EOS);

test/libsolidity/SolidityExpressionCompiler.cpp

@@ -168,7 +168,7 @@ bytes compileFirstExpression(
 				));
 
 			context.appendMissingLowLevelFunctions();
-			// NOTE: We intentionally disable optimisations for utility functions to simplfy the tests
+			// NOTE: We intentionally disable optimisations for utility functions to simplify the tests
 			context.appendYulUtilityFunctions({});
 			BOOST_REQUIRE(context.appendYulUtilityFunctionsRan());
 

test/libsolidity/semanticTests/externalContracts/_prbmath/PRBMathCommon.sol

@@ -3,7 +3,7 @@ pragma solidity >=0.8.0;
 
 /// @dev Common mathematical functions used in both PRBMathSD59x18 and PRBMathUD60x18. Note that this shared library
 /// does not always assume the signed 59.18-decimal fixed-point or the unsigned 60.18-decimal fixed-point
-// representation. When it does not, it is annonated in the function's NatSpec documentation.
+// representation. When it does not, it is annotated in the function's NatSpec documentation.
 library PRBMathCommon {
     /// @dev How many trailing decimals can be represented.
     uint256 internal constant SCALE = 1e18;

test/libsolidity/semanticTests/externalContracts/_prbmath/PRBMathUD60x18.sol

@@ -28,7 +28,7 @@ library PRBMathUD60x18 {
     /// @notice Calculates arithmetic average of x and y, rounding down.
     /// @param x The first operand as an unsigned 60.18-decimal fixed-point number.
     /// @param y The second operand as an unsigned 60.18-decimal fixed-point number.
-    /// @return result The arithmetic average as an usigned 60.18-decimal fixed-point number.
+    /// @return result The arithmetic average as an unsigned 60.18-decimal fixed-point number.
     function avg(uint256 x, uint256 y) internal pure returns (uint256 result) {
         // The operations can never overflow.
         unchecked {