HPCC-16406 Document BLAS Support in Std Library

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>

docs/ECLStandardLibraryReference/SLR-includer.xml

@@ -591,4 +591,6 @@
     <xi:include href="ECLStandardLibraryReference/SLR-Mods/WorkunitTimings.xml"
                 xmlns:xi="http://www.w3.org/2001/XInclude" />
   </chapter>
+  <xi:include href="ECLStandardLibraryReference/SLR-Mods/BLAS.xml"
+                xmlns:xi="http://www.w3.org/2001/XInclude" />
 </book>