add missing periods (.) to configdata descriptions

* includes `valid_value` descriptions in addition to `desc` fields

qutebrowser/config/configdata.yml

@@ -37,9 +37,9 @@ ignore_case:
   type:
     name: String
     valid_values:
-      - always: Search case-insensitively
-      - never: Search case-sensitively
-      - smart: Search case-sensitively if there are capital chars
+      - always: Search case-insensitively.
+      - never: Search case-sensitively.
+      - smart: Search case-sensitively if there are capital chars.
   default: smart
   desc: Find text on a page case-insensitively.
 
@@ -92,8 +92,8 @@ backend:
   type:
     name: String
     valid_values:
-      - webengine: Use QtWebEngine (based on Chromium)
-      - webkit: Use QtWebKit (based on WebKit, similar to Safari)
+      - webengine: Use QtWebEngine (based on Chromium).
+      - webkit: Use QtWebKit (based on WebKit, similar to Safari).
   default: webengine
   desc: >-
     The backend to use to display websites.
@@ -483,7 +483,7 @@ content.javascript.log:
 content.javascript.modal_dialog:
   type: Bool
   default: false
-  desc: Use the standard JavaScript modal dialog for `alert()` and `confirm()`
+  desc: Use the standard JavaScript modal dialog for `alert()` and `confirm()`.
 
 content.javascript.prompt:
   default: true
@@ -1182,7 +1182,7 @@ tabs.indicator_padding:
     left: 0
     right: 4
   type: Padding
-  desc: Padding for tab indicators
+  desc: Padding for tab indicators.
 
 tabs.last_close:
   default: ignore
@@ -1218,7 +1218,7 @@ tabs.padding:
     left: 5
     right: 5
   type: Padding
-  desc: Padding around text for tabs
+  desc: Padding around text for tabs.
 
 tabs.position:
   default: top
@@ -1406,7 +1406,7 @@ url.yank_ignored_parameters:
 window.hide_wayland_decoration:
   type: Bool
   default: false
-  desc: Hide the window decoration when using wayland (requires restart)
+  desc: Hide the window decoration when using wayland (requires restart).
 
 window.title_format:
   type:
@@ -1554,7 +1554,7 @@ colors.completion.scrollbar.fg:
 colors.completion.scrollbar.bg:
   default: '#333333'
   type: QssColor
-  desc: Color of the scrollbar in the completion view
+  desc: Color of the scrollbar in the completion view.
 
 colors.downloads.bar.bg:
   default: black
@@ -1885,7 +1885,7 @@ colors.webpage.bg:
   type:
     name: QtColor
     none_ok: true
-  desc: "Background color for webpages if unset (or empty to use the theme's color)"
+  desc: "Background color for webpages if unset (or empty to use the theme's color)."
 
 ## fonts