Fix several typos in comments and debug strings

Author: asakaev

js-envs-test-kit/src/test/scala/org/scalajs/jsenv/test/kit/TestEnv.scala

@@ -40,7 +40,7 @@ private[kit] class TestEnv private (
 
   def withOutErrHang(): TestEnv = {
     def hangStream() = new InputStream {
-      // read method that hangs indfinitely.
+      // read method that hangs indefinitely.
       def read(): Int = synchronized {
         while (true) wait()
         throw new AssertionError("unreachable code")

js-envs-test-kit/src/test/scala/org/scalajs/jsenv/test/kit/TestKitTest.scala

@@ -33,7 +33,7 @@ class TestKitTest {
 
       expectAssert(msg, cause)(body(kit))
 
-      assertFalse("faster than timout", deadline.isOverdue)
+      assertFalse("faster than timeout", deadline.isOverdue)
     }
 
     test(env.withSuccess(), null)

js-envs/src/main/scala/org/scalajs/jsenv/RunConfig.scala

@@ -115,8 +115,7 @@ final object RunConfig {
    *  1. inform it of the [[JSEnv]]'s capabilities
    *  1. invoke [[validate]] with every received [[RunConfig]]
    *
-   *  This ensures that enusre that all set config options are supported by the
-   *  [[JSEnv]].
+   *  This ensures that all set config options are supported by the [[JSEnv]].
    */
   final class Validator private (
       inheritIO: Boolean,