Documentation improvement: Stress importance of URI endings

[problame]

I cannot find the source for the online documentation which itself is a thing that should be fixed.

It took me a while to figure out that the specific URI endings .ics and .vcf are mandatory. While a hint about this is in the current documentation, it is

• buried in the client-specific configuration subsections
• inline
• hence not very visible

Furthermore, I found that the "full" URL scheme as described below works in more clients than mentioned in the docs.

Hence, as told in IRC, a little enhancement to the documentation text:

Section Starting the Client, new sub-section: General Configuration

Starting the Client

General Configuration

URL Schemes

Protocol	URL
CalDAV	https://[hostname]:[port]/[username]/[calendarname].ics/
CardDAV	https://[hostname]:[port]/[username]/[addressbookname].vcf/

Default for port is 5232.
Radicale will create the appropriate collection (e.g. calendarname.ics) automatically in the configured directory.
Important: The specific file endings (.ics, .vcf) and the trailing slash are required by some clients.

Lightning

[...]

[liZe]

The trailing slash is not needed anymore!