update comments

Author: hboutemy

src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java

@@ -1076,7 +1076,7 @@ public void execute() throws MojoExecutionException, CompilationFailureException
  try {
  if (fork) {
  if (compilerConfiguration.getExecutable() != null) {
- getLog().debug("Excutable: ");
+ getLog().debug("Executable: ");
  getLog().debug(" " + compilerConfiguration.getExecutable());
  }
  }
@@ -1496,14 +1496,13 @@ private String getMemoryValue(String setting) {
  return value;
  }
 
- // TODO remove the part with ToolchainManager lookup once we depend on
- // 3.0.9 (have it as prerequisite). Define as regular component field then.
  protected final Toolchain getToolchain() {
  Toolchain tc = null;
 
  if (jdkToolchain != null) {
- // Maven 3.3.1 has plugin execution scoped Toolchain Support
+ // require Maven 3.3.1, that has plugin execution scoped Toolchain support MNG-5755
  try {
+ // TODO use direct method invocation when prerequisite upgraded to Maven 3.3.1
  Method getToolchainsMethod = toolchainManager
  .getClass()
  .getMethod("getToolchains", MavenSession.class, String.class, Map.class);