Typo fixes: [SF#097860] and [SF#097864].

Author: Johannes Gijsbers

BUILD.txt

@@ -7,7 +7,7 @@ want it to stay that way, too.
 This means that we only need to ever build source releases. This is done by
 running:
 
-1.  Make sure the unit tests run! "./run_tests"
+1.  Make sure the unit tests run! "./run_tests.py"
 2.  Edit roundup/__init__.py and doc/announcement.txt to reflect the new
     version and appropriate announcements. Add truncated announcement to
     setup.py description field.

doc/admin_guide.txt

@@ -2,7 +2,7 @@
 Administration Guide
 ====================
 
-:Version: $Revision: 1.5.2.5 $
+:Version: $Revision: 1.5.2.6 $
 
 .. contents::
 
@@ -123,7 +123,7 @@ take:
     C:\sources\roundup-0.7.4> python roundup/scripts/roundup_server.py <normal arguments>
 
 7. Once you're comfortable that the upgrade will work using that copy, you
-   should instal the new version of the software::
+   should install the new version of the software::
 
     python setup.py install