add fpe warning to crusher build docs

docs/source_docs/getting_started/hpc/Crusher.rst

 OLCF Crusher TDS
 ================
 
-.. warning::
-   This does not currently work with ascent. 
-
 If this is your first time building MFIX-Exa on Joule2, please 
 review the general notes below and `Basics`_ section first.
 
@@ -40,6 +37,13 @@ review the general notes below and `Basics`_ section first.
       cmake --build . --target pic2dem
 
 
+.. warning::
+
+   MFIX-Exa currently experiences a floating point exception 
+   when running with ascent support. Make sure all of the 
+   fpe traps in your inputs are off.   
+
+
 Basics
 ------