Fix relevant 'make doc-pdf' warnings

[qed777]

Reported Leif Leonhardy on sage-release:

$ grep -i warning docpdf.log | grep -v "0 warn" | sort | uniq -c | sort -n 
      1 /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/en/tutorial/sagetex.rst:: WARNING: unusable reference target found: ../installation/index.html
      1 /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/fr/tutorial/sagetex.rst:: WARNING: unusable reference target found: ../../en/installation/index.html
      1 writing... /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/en/faq/faq-usage.rst:: WARNING: unusable reference target found: about:plugins
      1 writing... /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/en/reference/other/sagetex.rst:: WARNING: unusable reference target found: ../../installation/index.html
      1 writing... /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/en/tutorial/introduction.rst:: WARNING: unusable reference target found: ../installation/index.html
      1 writing... /mnt/usb1/scratch/mpatel/tmp/sage-4.5.3.rc0/devel/sage/doc/fr/tutorial/introduction.rst:: WARNING: unusable reference target found: ../../en/installation/index.html
      2 build succeeded, 1 warning.
      2 build succeeded, 2 warnings.
      3 LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right.
      4 )pdfTeX warning (ext4): destination with the same identifier (name{page.ii}) ha
      5 [5322] [5323] [5324] [5325] [5326] [5327] [5328]pdfTeX warning (ext4): destinat
      5                                                    [5329]pdfTeX warning (ext4):
      5 [5330]pdfTeX warning (ext4): destination with the same identifier (name{sage.mo
      5 [5331]pdfTeX warning (ext4): destination with the same identifier (name{sage.mo
      5 [5332]pdfTeX warning (ext4): destination with the same identifier (name{sage.mo
      5 [5333]pdfTeX warning (ext4): destination with the same identifier (name{sage.mo
      5 [5504pdfTeX warning (ext4): destination with the same identifier (name{mcd}) ha
      5 dfTeX warning (ext4): destination with the same identifier (name{sage.modular.m
      5 Package amsmath Warning: Foreign command \atopwithdelims;
      5 Package amsmath Warning: Foreign command \over;
      5 pdfTeX warning (dest): name{sudoku-escargot} has been referenced but does not e
      5 pdfTeX warning (dest): name{sudoku-royle} has been referenced but does not exis
      5 pdfTeX warning (dest): name{sudoku-top95} has been referenced but does not exis
      5 pdfTeX warning (dest): name{sudoku-wikipedia} has been referenced but does not 
      5                                                   pdfTeX warning (ext4): destin
      5 (see the transcript file for additional information)pdfTeX warning (dest): name
      5 []\T1/ptm/b/n/10 Warning:  \T1/ptm/m/n/10 You should not cre-ate in-stances of 
      5 TeX warning (ext4): destination with the same identifier (name{sage.modular.mod
      8                                                    [1])pdfTeX warning (ext4): d
      8                                                    [1]pdfTeX warning (ext4): de
     20 (/usr/share/texmf-texlive/tex/latex/amsfonts/umsb.fd)pdfTeX warning (ext4): des
     45                        [1]pdfTeX warning (ext4): destination with the same iden
     45 pdfTeX warning (ext4): destination with the same identifier (name{page.i}) has 
     50 pdfTeX warning (ext4): destination with the same identifier (name{sage.modular.
    735 Package hyperref Warning: Token not allowed in a PDFDocEncoded string,

(The output above is from make doc-pdf for 4.5.3.rc0 on sage.math. Here's the full log.)

As John Cremona suggests, many of these may be raised by Sphinx itself.

Some of the others are false positives, but others appears to be problems with the Sage documentation.

Component: documentation

Keywords: LaTeX, PDF, Sphinx, warning

Issue created by migration from https://trac.sagemath.org/ticket/9844

[nexttime]

Changed keywords from none to LaTeX, PDF, Sphinx, warning

[nexttime]

comment:2

Thanks for doing my job, Mitesh. :)

(I wanted to sort the warnings by category, but trac was continually unavailable... In general, "0 warn" should be substituted by " 0 warn".)

[mkoeppe]

Closing as outdated