helptext.html: improved wording (#614)

* explain creation of GRASS GIS database also textually:

"as explained above" is the **graphical** explanation.
I have racked my brains to figure out what you are really trying to say.
**UNTESTED** ... **GUESSING ONLY**

lib/init/helptext.html

@@ -175,7 +175,7 @@ GRASS GIS can be run entirely without using the graphical user interface.
 For a first time startup, the following steps have to be followed:
 
 <ol>
-<li> Create a GRASS GIS database as explained above.</li>
+<li> Create the GRASS GIS database directory (with a file manager; or on command line: <tt>mkdir /home/user/grassdata</tt></li>
 <li> Create a new location, including it's default PERMANENT mapset,
      without entering the new location:
 <ul>