[SPARK-4326] fix unidoc

There are two issues:

1. specifying guava 11.0.2 will cause hashInt not found in unidoc (any reason to force the version here?)
2. unidoc doesn't recognize static class defined in a base class

aarondav srowen vanzin

Author: Xiangrui Meng <meng@databricks.com>

Closes #3253 from mengxr/SPARK-4326 and squashes the following commits:

53967bf [Xiangrui Meng] fix unidoc
[SPARK-4372][MLLIB] Make LR and SVM's default parameters consistent in Scala and Python

The current default regParam is 1.0 and regType is claimed to be none in Python (but actually it is l2), while regParam = 0.0 and regType is L2 in Scala. We should make the default values consistent. This PR sets the default regType to L2 and regParam to 0.01. Note that the default regParam value in LIBLINEAR (and hence scikit-learn) is 1.0. However, we use average loss instead of total loss in our formulation. Hence regParam=1.0 is definitely too heavy.

In LinearRegression, we set regParam=0.0 and regType=None, because we have separate classes for Lasso and Ridge, both of which use regParam=0.01 as the default.

davies atalwalkar

Author: Xiangrui Meng <meng@databricks.com>

Closes #3232 from mengxr/SPARK-4372 and squashes the following commits:

9979837 [Xiangrui Meng] update Ridge/Lasso to use default regParam 0.01 cast input arguments
d3ba096 [Xiangrui Meng] change 'none' back to None
1909a6e [Xiangrui Meng] change default regParam to 0.01 and regType to L2 in LR and SVM
[SPARK-4310][WebUI] Sort 'Submitted' column in Stage page by time

Author: zsxwing <zsxwing@gmail.com>

Closes #3179 from zsxwing/SPARK-4310 and squashes the following commits:

b0d29f5 [zsxwing] Sort 'Submitted' column in Stage page by time
[SPARK-3722][Docs]minor improvement and fix in docs

https://issues.apache.org/jira/browse/SPARK-3722

Author: WangTao <barneystinson@aliyun.com>

Closes #2579 from WangTaoTheTonic/docsWork and squashes the following commits:

6f91cec [WangTao] use more wording express
29d22fa [WangTao] delete the specified version link
34cb4ea [WangTao] Update running-on-yarn.md
4ee1a26 [WangTao] minor improvement and fix in docs
Merge remote-tracking branch 'upstream/master' into LDA