Add the tex-requirement to the "FAQ" section in the documentation (#126)

* Add tex-requirement to troubleshooting

* Mention google colab

docs/source/getting_started/troubleshooting.md

@@ -1,13 +1,20 @@
-# Troubleshooting
+# FAQ: Frequently asked questions
 
 ## My version of matplotlib cannot find font XYZ?!
 
-Some of the fonts that `tueplot` provides (e.g., `Times` or `Roboto`) needs to be installed on your machine before matplotlib can find it.
-This means that you need to find a `.ttf` file online (e.g., `Roboto` family is available at Google fonts: https://fonts.google.com/specimen/Roboto),
+Some fonts that `tueplot` provides (e.g., `Times` or `Roboto`) must be installed on your machine before matplotlib can find them.
+This means that you need to find a `.ttf` file online (e.g., the `Roboto` family is available at Google fonts: [link-to-roboto](https://fonts.google.com/specimen/Roboto),
 download it, and install it. For Ubuntu, this means opening the file (with your font manager) and clicking `install`.
 There are probably many other ways to do this.
 Once the font is installed, delete your matplotlib cache (usually: `rm ~/.cache/matplotlib -rf`) and restart your notebook (not just the kernel).
-See also https://stackoverflow.com/questions/42097053/matplotlib-cannot-find-basic-fonts/42841531.
+See also [this question on Stack Overflow](https://stackoverflow.com/questions/42097053/matplotlib-cannot-find-basic-fonts/42841531).
+
+On a related note: if you want to use the Latex version of the fonts/bundles, your system must include the required tex packages.
+See [this Stack Overflow discussion](https://stackoverflow.com/questions/55746749/latex-equations-do-not-render-in-google-colaboratory-when-using-matplotlib)
+for information.
+You may encounter this problem when using Tueplots in combination with a Google Colab notebook.
+
+
 
 ## My fonts are not displayed as expected  with `plt.rc_context()`
 
@@ -16,33 +23,31 @@ If someone knows why, please let us know. :)
 
 ## I am still getting 'overfull hbox' errors in my latex code
 
-Even though the figsizes delivered by tueplots match the figure sizes in style files exactly,
-sometimes, figures can be a few pt wider than what latex allows.
+Even though the figure sizes delivered by Tueplots match the figure sizes in style files exactly, sometimes, figures can be a few points wider than what latex allows.
 Visually, this does not make any difference,
-but it might lead to 'overfull hbox' raised by, e.g., 'pdflatex'.
-This is not tueplots fault, but likely due to the optimisation that matplotlib carries out
+but it might lead to an 'overfull hbox' raised by, e.g., 'pdflatex'.
+This is not Tueplots' fault but likely due to the optimisation that matplotlib carries out
 as part of constrained_layout=True or tight_layout=True.
 Refer to the <a href=https://matplotlib.org/stable/tutorials/intermediate/constrainedlayout_guide.html>constrained layout documentation</a>
 for more info.
 
 **Solution:**
 If you really cannot live with this warning, there are the following possible solutions:
-* Instead of `\includegraphics(<plot>)`, use `\includegraphics[width=\textwidth](<plot>)`
-(to fix the final few pt -- the visual difference is zero).
+* Instead of `\includegraphics(<plot>)`, use `\includegraphics[width=\textwidth](<plot>)`. This fixes the final few pixels, and the visual difference is non-existent.
 * Set the `rel_width` in the figsizes to, e.g., `rel_width=0.97` and use `\includegraphics(<plot>)` as usual.
 
 
 ## My submission template requires Type 1 fonts
 
-Type 1 fonts are a tricky requirements; for example, because
+Type 1 fonts are a tricky requirement; for example, because
 <a href=https://helpx.adobe.com/fonts/kb/postscript-type-1-fonts-end-of-support.html> Adobe will disable support for authoring with Type 1 fonts in January 2023 </a>.
-Matplotlib cannot do Type 1 fonts, but uses Type 3 fonts as a default.
+Matplotlib cannot do Type 1 fonts but uses Type 3 as a default.
 There is also no way of making matplotlib use Type 1 fonts.
-The only options are Type 3 fonts and Type 42 (/TrueType) fonts.
+The only options are Type 3 and Type 42 (/TrueType) fonts.
 
 **Solution:**
-If you _need_ Type 1 fonts, using TeX typesetting usually does the trick: E.g., via `bundles.icml2022(usetex=True)`,
+If you _need_ a Type 1 font, using TeX typesetting usually does the trick: E.g., via `bundles.icml2022(usetex=True)`,
 or `fonts.icml2022_tex()`.
 If the goal, however, is only to avoid type 3 fonts, adding
-`plt.rcParams.update({"pdf.fonttype": 42})` to your plotting code will a PDF with `TrueType` fonts.
+`plt.rcParams.update({"pdf.fonttype": 42})` to your plotting code will create a PDF with `TrueType` fonts.
 See <a href=https://github.com/pnkraemer/tueplots/issues/77>this issue</a> for more details.