Merge "Document that re-inserting the same blocked number is permitted." into nyc-dev

 * Apps can optionally provide the {@link BlockedNumbers#COLUMN_E164_NUMBER} which is the phone

 * number's E164 representation. The provider automatically populates this column if the app does

 * not provide it. Note that this column is not populated if normalization fails or if the address

 * is not a phone number (eg: email). The provider enforces uniqueness constraint on this column.

 * is not a phone number (eg: email).

 * <p>

 * Attempting to insert an existing blocked number (same

 * {@link BlockedNumbers#COLUMN_ORIGINAL_NUMBER} column) will result in replacing the existing

 * blocked number.

 * <p>

 * Examples:

 * <pre>

 * ContentValues values = new ContentValues();