fix typos in text

tools/snvphyl-tools/filter-stats/filter-stats.xml

 <tool id="filterstat" name="Filter Stats" version ="0.0.1">
-  <description>Identify repeat elements using Mummer</description>
+  <description>Identify number of positions excluded based on filtered status</description>
   <requirements>
     <requirement type="package" version="1.1">snvphyl</requirement>
     <requirement type="package" version="5.18.1">perl</requirement>
@@ -34,7 +34,7 @@
 What it does
 ============
 
-This script prints a stat summary of the number of N's and -'s found in the psudo-alignment positions tab delimited file.
+This script prints a stat summary of the number of N's and -'s found in the pseudo-alignment positions tab delimited file.
 
 
 Usage