Update docs

doc/changelog.asciidoc

@@ -27,6 +27,8 @@ Added
   categories are shown in the `:open` completion, and how they are ordered.
 - New `:config-add-dict` and `:config-add-list` commands to easily add a new
   element to a dict/list setting.
+- New `hints.selectors` setting which allows to configure what CSS selectors
+  are used for hints, and also allows adding custom hint groups.
 
 Changed
 ~~~~~~~
@@ -42,6 +44,7 @@ Changed
 - The `:open` completion now also shows search engines by default.
 - The `content.host_blocking.enabled` setting now supports URL patterns, so the
   adblocker can be disabled on a given page.
+- Elements with a `tabindex` attribute now also get hints by default.
 
 Fixed
 ~~~~~

doc/help/commands.asciidoc

@@ -576,6 +576,10 @@ Start hinting.
  - `inputs`: Only input fields.
  
 
+ Custom groups can be added via the `hints.selectors` setting
+ and also used here.
+ 
+
 
 * +'target'+: What to do with the selected element. 
 

qutebrowser/browser/hints.py

@@ -661,6 +661,9 @@ class HintManager(QObject):
                 - `images`: Only images.
                 - `inputs`: Only input fields.
 
+                Custom groups can be added via the `hints.selectors` setting
+                and also used here.
+
             target: What to do with the selected element.
 
                 - `normal`: Open the link.