Fix javadoc typos in Color and Context

Context: you're -> your
Color: blue -> alpha (copy-paste mistake from method above)

Change-Id: I4c4c5bd33f464c7902245e5fc32016a30e19a2a4

core/java/android/content/Context.java

@@ -4039,7 +4039,7 @@ public abstract class Context {
      * <p>Note: When implementing this method, keep in mind that new services can be added on newer
      * Android releases, so if you're looking for just the explicit names mentioned above, make sure
      * to return {@code null} when you don't recognize the name &mdash; if you throw a
-     * {@link RuntimeException} exception instead, you're app might break on new Android releases.
+     * {@link RuntimeException} exception instead, your app might break on new Android releases.
      *
      * @param name The name of the desired service.
      *

graphics/java/android/graphics/Color.java

@@ -767,7 +767,7 @@ public class Color {
      * Returns the alpha component encoded in the specified color long.
      * The returned value is always in the range \([0..1]\).
      *
-     * @param color The color long whose blue channel to extract
+     * @param color The color long whose alpha channel to extract
      * @return A float value in the range \([0..1]\)
      *
      * @see #colorSpace(long)