Tweak install docs template

Shorten setup, add missing comma

Author: jkbrzt

.github/workflows/docs-update-install.yml

@@ -3,6 +3,7 @@ on:
     branches:
       - master
     paths:
+      - .github/workflows/docs-update-install.yml
       - docs/installation/*
 
   # Allow to call the workflow manually

docs/installation/installation.jinja2

@@ -19,16 +19,16 @@ Do not edit here, but in docs/installation/.
         {% endif %}
 
         {% if tool.links.setup %}
-            To install [{{ tool.name }}]({{ tool.links.homepage }}) follow [installation instructions]({{ tool.links.setup }}).
+            To install [{{ tool.name }}]({{ tool.links.homepage }}), see [its installation]({{ tool.links.setup }}).
         {% endif %}
 
         ```bash
-        # Install
+        # Install httpie
         $ {{ tool.commands.install|join('\n$ ') }}
         ```
 
         ```bash
-        # Upgrade
+        # Upgrade httpie
         $ {{ tool.commands.upgrade|join('\n$ ') }}
         ```
     {% endfor %}