Fix typos.

Small typo fixes in docstrings.

Author: vi4m

Sources/Commands/UserToolchain.swift

@@ -43,14 +43,14 @@ struct UserToolchain: Toolchain {
 #endif
 
  /// Lookup an executable path from environment variable value. This method searches in the following order:
- /// * If env value is a valid abolsute path, return it.
+ /// * If env value is a valid absolute path, return it.
  /// * If env value is relative path, first try to locate it in current working directory.
  /// * Otherwise, in provided search paths.
  ///
  /// - Parameters:
  /// - value: The value from environment variable.
  /// - cwd: The current working directory to look in.
- /// - searchPath: The addtional search path to look in if not found in cwd.
+ /// - searchPath: The additional search path to look in if not found in cwd.
  /// - Returns: Valid path to executable if present, otherwise nil.
  static func lookupExecutablePath(inEnvValue value: String?, currentWorkingDirectory cwd: AbsolutePath, searchPaths: [AbsolutePath]) -> AbsolutePath? {
  // We should have a value to continue.