[welcome] Update .conf documentation

- fix typo
- don't suggest google as internetCheckUrl
- mark TODOs for #1384

src/modules/welcome/welcome.conf

@@ -10,14 +10,19 @@
 # can check requirements for installation.
 ---
 # Display settings for various buttons on the welcome page.
-# The URLs themselves come from branding.desc is the setting
-# here is "true". If the setting is false, the button is hidden.
+# The URLs themselves come from `branding.desc`. Each button
+# is show if the corresponding *show<buttonname>* setting
+# here is "true". If the setting is "false", the button is hidden.
+# Empty or not-set is interpreted as "false".
+#
+# TODO:3.3 Remove the URL fallback here; URLs only in `branding.desc`
+#
 # The setting can also be a full URL which will then be used
-# instead of the one from the branding file, or empty or not-set
-# which will hide the button.
+# instead of the one from the branding file.
 showSupportUrl:         true
 showKnownIssuesUrl:     true
 showReleaseNotesUrl:    false
+# TODO:3.3 Move to branding, keep only a bool here
 showDonateUrl:          https://kde.org/community/donations/
 
 # Requirements checking. These are general, generic, things
@@ -26,7 +31,7 @@ showDonateUrl:          https://kde.org/community/donations/
 requirements:
     # Amount of available disk, in GiB. Floating-point is allowed here.
     # Note that this does not account for *usable* disk, so it is possible
-    # to pass this requirement, yet have no space to install to.
+    # to satisfy this requirement, yet have no space to install to.
     requiredStorage:    5.5
 
     # Amount of available RAM, in GiB. Floating-point is allowed here.
@@ -34,7 +39,10 @@ requirements:
 
     # To check for internet connectivity, Calamares does a HTTP GET
     # on this URL; on success (e.g. HTTP code 200) internet is OK.
-    internetCheckUrl:   http://google.com
+    # Use a privacy-respecting URL here, preferably in your distro's domain.
+    #
+    # The URL is only used if "internet" is in the *check* list below.
+    internetCheckUrl:   http://example.com
 
     # List conditions to check. Each listed condition will be
     # probed in some way, and yields true or false according to