Fix typo in docs

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

Author: soumyamahunt

Sources/SwiftSyntaxMacrosTestSupport/Assertions.swift

@@ -254,8 +254,9 @@ 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`).
-///   - applyFixIts: If specified, filters the Fix-Its that are applied to generate `fixedSource` to only those whose message occurs in this array. If `nil`, all Fix-Its from the diagnostics are applied.
-///   - fixedSource: If specified, asserts that the source code after applying Fix-Its matches this string.
+///   - 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.
 ///   - testFileName: The name of the test file name to use.
 ///   - indentationWidth: The indentation width used in the expansion.