Update msg.cfg

Clarified that need to delete sam_files folder to try different max_mapped_reads

example/msg.cfg

@@ -56,6 +56,7 @@ parent2=dsec-all-chromosome-r1.3.fasta
 # Individuals with the most reads often produce small, clearly incorrect, hmm prob shifts where there is a 
 # pile of improper mapping. Perhaps repeetitive regions? Anyway, for individuals with fewer reads the hmm plows 
 # right through these regions.
+# NOTE: This option will truncate the sam files, so to try different # reads, you need to delete the *sam_files folder
 #max_mapped_reads=10000
 
 # Algorithm for constructing BWT index: bwtsw (default) or is (for parental