updates: template #, min version, timing on demo mode

Mention testing takes < 5 minutes (to contrast with full install of 30
minutes).

Change min version to 3.6+ from 3.4+

five templates are provided not two

include FTS buzzword in list.

Reformat some items.

Author: rouilj

doc/features.txt

@@ -14,11 +14,11 @@ from Ka-Ping Yee in the :index:`Software Carpentry` "Track" design competition.
 
 *simple to install*
  - installation (including web interface) takes about 30 minutes
- - instant-gratification ``python demo.py`` :)
- - two templates included in the distribution for you to base your tracker on
+ - instant-gratification ``python demo.py`` takes less than 5 minutes :)
+ - five templates included in the distribution for you to base your tracker on
  - play with the demo, customise it and then use *it* as the template for
    your production tracker
- - requires *no* additional support software - python (2.7 or 3.4+) is
+ - requires *no* additional support software - python (2.7 or 3.6+) is
    enough to get you going
  - easy to set up higher-performance storage backends like sqlite_,
    mysql_ and postgresql_
@@ -55,9 +55,9 @@ from Ka-Ping Yee in the :index:`Software Carpentry` "Track" design competition.
    with decent response times
  - database indexes are automatically added for those backends that
    support them (sqlite, mysql and postgresql)
- - indexed text searching giving fast responses to searches across all
+ - indexed full text search (FTS) gives fast responses to searches across all
    messages and indexed string properties
- - support for the Xapian, Whoosh. sqlite or postgres full-text
+ - support for the Xapian, Whoosh, sqlite or postgres full-text
    indexing engines for large trackers
 
 *documented*
@@ -73,7 +73,8 @@ from Ka-Ping Yee in the :index:`Software Carpentry` "Track" design competition.
  - authentication of user registration and user-driven password resetting
    using email and one time keys
  - may be run using WSGI or through CGI as a normal cgi script, as a
-   stand-alone web server, under mod_wsgi (mod_python is deprecated) or through Zope
+   stand-alone web server, under mod_wsgi (mod_python is deprecated)
+   or through Zope
  - searching may be performed using many constraints, including a full-text
    search of messages attached to issues
  - file attachments (added through the web or email) are served up with the