[SPARK-4089][Doc][Minor] The version number of Spark in _config.yaml is wrong.

[sarutak]

The version number of Spark in docs/_config.yaml for master branch should be 1.2.0 for now.

[SparkQA]

Test build #22210 has finished for PR 2943 at commit aba7fb4.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class SparkContext(config: SparkConf) extends SparkStatusAPI with Logging
  • class JobUIData(
  • public final class JavaStatusAPIDemo
  • public static final class IdentityWithDelay<T> implements Function<T, T>

[sarutak]

retest this please.

[SparkQA]

Test build #22242 has finished for PR 2943 at commit aba7fb4.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[andrewor14]

Interesting... we're not 1 version off but 2. I'm merging this thanks.