Update accuracy_verification.md

fixed typo covert to convert

Author: babstar99

docs/accuracy_verification.md

@@ -15,7 +15,7 @@ This is a replication and confirmation of the procedure done by [RTKLibExplorer
 The process goes like this: 
 
 * Find a local monument
-* Covert the coordinates
+* Convert the coordinates
 * Take measurements
 * Calculate differences