Fix typo in docs

Co-authored-by: Jeffrey Macko <[email protected]>

Author: soumyamahunt

Sources/SwiftSyntaxMacrosTestSupport/Assertions.swift

@@ -254,7 +254,7 @@ func assertDiagnostic(
 ///   - macros: The macros that should be expanded, provided as a dictionary
 ///     mapping macro names (e.g., `"stringify"`) to implementation types
 ///     (e.g., `StringifyMacro.self`).
-///   - conformanceMap: The protocols that maco should conform to, provided as
+///   - conformanceMap: The protocols that macro should conform to, provided as
 ///     a dictionary mapping macro names (e.g., `"AddCodable"`) to protocols names
 ///     (e.g., `"Decodable"`, `"Encodable"` etc.).
 ///   - testModuleName: The name of the test module to use.