Minor fixes to .md, making markdownlint happier

CONTRIBUTING.md

@@ -4,7 +4,7 @@
 
 As most of the other projects written in Python, we use the [PEP 8](https://www.python.org/dev/peps/pep-0008/). Though, we ignore some of the recommendations:
 
-* E501 - Maximum line length (79 characters). The general limit we have is somewhere around 120-130.
+- E501 - Maximum line length (79 characters). The general limit we have is somewhere around 120-130.
 
 *Recommended video: "[Beyond PEP 8 -- Best practices for beautiful intelligible code](https://www.youtube.com/watch?v=wf-BqAjZb8M)" by Raymond Hettinger at PyCon 2015, which talks about the famous P versus NP problem.*
 
@@ -94,7 +94,7 @@ metadata specifications and to the tag mapping tables used by various audio soft
 - [APE-Tags](http://wiki.hydrogenaud.io/index.php?title=APE_key)
 - [Matroska \| Tag Specifications](https://www.matroska.org/technical/specs/tagging/index.html)
 - [ASF / WMA](http://msdn.microsoft.com/en-us/library/ms867702.aspx)
-- MP4: See iTunes Metadata Format Specification (was available at https://developer.apple.com/, but does not seem to be available anymore)
+- MP4: See iTunes Metadata Format Specification (was available at [Apple Developer website](https://developer.apple.com/), but does not seem to be available anymore)
 - [RIFF Tags](https://exiftool.org/TagNames/RIFF.html) / [Resource Interchange File Format: INFO List Chunk](https://www.tactilemedia.com/info/MCI_Control_Info.html) / [Multimedia Programming Interface and Data Specifications 1.0](http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf)
 - [Mutagen Spec Collection](https://mutagen-specs.readthedocs.io/en/latest/)
 

INSTALL.md

@@ -174,9 +174,7 @@ below.
 
 You can verify the signature with e.g.:
 
-```
-gpg --verify picard-2.9.tar.gz.asc
-```
+    gpg --verify picard-2.9.tar.gz.asc
 
 Make sure the key fingerprint in the output matches the fingerprint of the
 GPG key below.

po/README.md

@@ -23,7 +23,7 @@ Their translations are handled at <https://translations.metabrainz.org/projects/
 One can update `picard.pot` using:
 
 ```bash
-$ python setup.py regen_pot_file
+python setup.py regen_pot_file
 ```
 
 Weblate will _automatically_ sync the changed `picard.pot` and update the translation files (`*.po`) with msgmerge.
@@ -37,7 +37,7 @@ Translations for the strings from `org.musicbrainz.Picard.appdata.xml.in` and `o
 One can update `appstream/picard-appstream.pot` using:
 
 ```bash
-$ python setup.py regen_appdata_pot_file
+python setup.py regen_appdata_pot_file
 ```
 
 Weblate will _automatically_ sync the changed `picard-appstream.pot` and update the translation files (`appstream/*.po`) with msgmerge.
@@ -61,7 +61,7 @@ Picard maintainers can regenerate `picard/const/attributes.py` and `picard/const
 
 
 ```bash
-$ python setup.py update_constants --weblate-key={YOUR_WEBLATE_API_KEY}
+python setup.py update_constants --weblate-key={YOUR_WEBLATE_API_KEY}
 ```
 
 Instead of entering the Weblate API key each time you can also place a file `.weblate.ini` in the root of the repository with the following content:

resources/README.md

@@ -12,8 +12,8 @@ For adding a new image into existing resources, follow these steps:
 1. Add image file (like .png) into `resources/images/` and source file (like .svg) into `resources/img-src`.
 2. Generate new .qrc file. This would automatically detect any changes in directory.
 
-       $ python3 makeqrc.py
+       python3 makeqrc.py
 
 3. Create binary of all resources which will be used by Picard.
 
-       $ python3 compile.py
+       python3 compile.py