Optimized tests: remove markups for warnings

tests/root/footnote.txt

@@ -53,9 +53,3 @@ footenotes
 .. [#] footnotes in table caption
 
 .. [#] footnotes in table
-
-
-missing target
---------------------
-[missing]_ citation
-

tests/root/images.txt

@@ -15,9 +15,6 @@ Sphinx image handling
 .. an image with unspecified extension
 .. image:: img.*
 
-.. a non-existing image with .*
-.. image:: foo.*
-
 .. a non-local image URI
 .. image:: http://www.python.org/logo.png
 

tests/root/includes.txt

@@ -15,10 +15,6 @@ Test file and literal inclusion
 .. literalinclude:: literal.inc
    :language: python
 
-.. should give a warning
-.. literalinclude:: wrongenc.inc
-   :language: none
-
 .. should succeed
 .. literalinclude:: wrongenc.inc
    :encoding: latin-1

tests/root/markup.txt

@@ -161,7 +161,6 @@ Adding \n to test unescaping.
 * :doc:`subdir/includes`
 * ``:download:`` is tested in includes.txt
 * :option:`Python -c option <python -c>`
-* This used to crash: :option:`&option`
 
 Test :abbr:`abbr (abbreviation)` and another :abbr:`abbr (abbreviation)`.
 
@@ -295,13 +294,6 @@ Code blocks
        false
    end
 
-.. code-block:: c
-
-   import sys
-
-   sys.stdout.write('hello world!\n')
-
-
 Misc stuff
 ----------
 
@@ -381,13 +373,6 @@ Index markup
    see: from; to
    seealso: fromalso; toalso
 
-Invalid index markup...
-
-.. index::
-   single:
-   pair:
-   keyword:
-
 .. index::
    !Main, !Other
    !single: entry; pair