docs: readme.rst: better parsing of hyperlink

Author: manu-chroma

README.rst

@@ -38,7 +38,7 @@ To install from source::
 
 Remember, if co-installing multiple CWL implementations then you need to
 maintain which implementation ``cwl-runner`` points to via a symbolic file
-system link or [another facility](https://wiki.debian.org/DebianAlternatives).
+system link or `another facility <https://wiki.debian.org/DebianAlternatives>`_.
 
 Run on the command line
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