[docs] Fix sphinx doc generation errors

Summary:
Errors fixed:
 - GettingStarted: Duplicate explicit target name: "cmake"
 - GlobalISel: Unexpected indentation
 - LoopTerminology: Explicit markup ends without a blank line; unexpected unindent
 - ORCv2: Definition list ends without a blank line; unexpected unindent
 - Misc: document isn't included in any toctree

Verified that a clean docs build (`rm -rf docs/ && ninja docs-llvm-html`) passes with no errors. Spot checked the individual pages to make sure they look OK.

Reviewers: thakis, dsanders

Reviewed By: dsanders

Subscribers: arphaman, llvm-commits, lhames, rovka, dsanders, reames

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66183

llvm-svn: 368932
diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
index a874b49..479beca 100644
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -95,7 +95,7 @@
        ``make -j NNN`` (with an appropriate value of NNN, e.g. number of CPUs
        you have.)
 
-   * For more information see `CMake <CMake.html>`_
+   * For more information see `CMake <CMake.html>`__
 
    * If you get an "internal compiler error (ICE)" or test failures, see
      `below`_.
@@ -169,7 +169,7 @@
 =========================================================== ============ ==========================================
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
-`CMake <http://cmake.org/>`_                                >=3.4.3      Makefile/workspace generator
+`CMake <http://cmake.org/>`__                               >=3.4.3      Makefile/workspace generator
 `GCC <http://gcc.gnu.org/>`_                                >=5.1.0      C/C++ compiler\ :sup:`1`
 `python <http://www.python.org/>`_                          >=2.7        Automated test suite\ :sup:`2`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`3`