Also document manual plugin load

(why wasn’t that already here?)

doc/source/commands.rst

@@ -59,10 +59,15 @@ These commands work in *any* tab.
     /quit
         Just disconnect from the server and exit poezio.
 
-    /plugin
+    /load
         **Usage:** ``/load <plugin name>``
 
-        Load a plugin.
+        Load or reload a plugin.
+
+    /unload
+        **Usage:** ``/unload <plugin name>``
+
+        Unload a plugin.
 
     /plugins
         List the loaded plugins.

doc/source/plugins/index.rst

@@ -33,6 +33,12 @@ e.g.
 
     plugins_autoload = gpg:tell:exec
 
+Manual plugin load
+------------------
+
+Plugins can of course be loaded with the command :term:`/load` and unloaded
+with the command :term:`/unload`.
+
 .. _plugin-configuration:
 
 Plugin configuration

plugins/irc.py

@@ -100,7 +100,7 @@ class Plugin(BasePlugin):
         sections = self.config.sections()
 
         for section in (s for s in sections if s != 'irc'):
-            server_suffix = '%%%s@%s' % (section, gateway)
+            server_suffix = '%{}@{}'.format(section, gateway)
 
             already_opened = False
             for tab in self.core.tabs: