Update docs/technical_reference/unit_models/nanofiltration_0D.rst

Co-authored-by: MarcusHolly <96305519+MarcusHolly@users.noreply.github.com>

docs/technical_reference/unit_models/nanofiltration_0D.rst

@@ -24,7 +24,7 @@ The ``Nanofiltration0D`` model has the following degrees of freedom
    * inlet state
    * permeate pressure
    * solvent recovery fraction (``solvent_recovery``)
-   * solute rejection fractions (``rekection_comp``) for all solutes EXCEPT the one identified as the electroneutrality species.
+   * solute rejection fractions (``rejection_comp``) for all solutes EXCEPT the one identified as the electroneutrality species.
 
 The following additional degrees of freedom  may exist depending on configuration options