[R][DOC] update R installation guide (apache#6457)

Documentation update for ImageRecordIter (apache#6354)

* Document update for ImageRecordIter.

* Better ordering of description.

* Updated as per the feedback.

* Updated as per the feedback.

Fix search function for new toc (apache#6065)

* Fix search function

* Small fix

0.9.3 release 2

[RELEASE] v0.9.3 official release (apache#4767)

[Release] v0.9.2 MinPy compatible release

[Release] v0.9.1 pre-release (NNVM refactor)

	[RELEASE] v0.8 Release (Last release before NNVM refactor (apache#4409)

* [RELEASE] v0.8 Release (Last release before NNVM refactor

* fix

Fix css (apache#3617)

* Fix navigation bar issues

* Small fix

* .DS_Store banished!

* Fix for very small width device

* Small fix

* Reduce banner title font size for small screen

* Fix section-tout disorder

* Rearrange the position of collaborators

Fix a typo include/symbolic.h (apache#2281)