doc: tweak known-issues for PDF processing
Update known-issues pattern for PDF processing to also work with updated
xelatex tools from Ubuntu 20.04
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^WARNING: Not copying tabs assets! Not compatible with latex builder
-^Latexmk: Run number 1 of rule 'pdflatex'
-^This is XeTeX, Version .* \(preloaded format=xelatex\)
-^ restricted \\write18 enabled.
-^entering extended mode
+#
^Latexmk: Summary of warnings:
^ Latex failed to resolve [0-9]+ reference\(s\)
^ Latex failed to resolve [0-9]+ citation\(s\)
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-^Latexmk: Run number 1 of rule 'makeindex acrn.idx'
-^Latexmk: calling xindy\( -L english -C utf8 -M sphinx.xdy -q -o acrn.ind acrn.idx \)
-#
-^Latexmk: Run number [2-4] of rule 'pdflatex'
+^Latexmk: Run number [1-4] of rule 'pdflatex'
^This is XeTeX, Version .* \(preloaded format=xelatex\)
^ restricted \\write18 enabled.
^entering extended mode
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-^Latexmk: Run number [2-4] of rule 'makeindex acrn.idx'
+^Latexmk: Run number [1-4] of rule 'makeindex acrn.idx'
+#
^Latexmk: calling xindy\( -L english -C utf8 -M sphinx.xdy -q -o acrn.ind acrn.idx \)
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+^Latexmk: Summary of warnings from last run of \(pdf\)latex:
+^ =====Latex reported missing or unavailable character\(s\).
+^=====See log file for details.
+#
