typo corrected

modules/DL_MESO_DPD/format_dlmeso_dpd/readme.rst

@@ -32,7 +32,7 @@ utility for DL_MESO_DPD, the Dissipative Particle Dynamics (DPD) code from the D
 
 It converts the trajectory (HISTORY) files from *unformatted* to a
 human readable form, (optionally) including explicative comments about all the
-quantities. This module is mainly for learning/checking purpouses.
+quantities. This module is mainly for learning/checking purposes.
 The first aim is to help the user to check that the
 system was prepared as intended (e.g., showing all the bead properties and
 initial positions, all the bonds etc).