[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/tutorial/index.rst b/llvm/docs/tutorial/index.rst
index 6fae00a..1a5277d 100644
--- a/llvm/docs/tutorial/index.rst
+++ b/llvm/docs/tutorial/index.rst
@@ -10,9 +10,10 @@
    :glob:
    :numbered:
 
-#. `My First Language Frontend with LLVM Tutorial <MyFirstLanguageFrontend/index.html>`_
-   This is the "Kaleidoscope" Language tutorial, showing how to implement 
-   a simple language using LLVM components in C++.
+   MyFirstLanguageFrontend/index
+
+This is the "Kaleidoscope" Language tutorial, showing how to implement a simple
+language using LLVM components in C++.
 
 Kaleidoscope: Implementing a Language with LLVM in Objective Caml
 =================================================================