Apply suggestions from code review

Co-authored-by: Peter Chang <peter.chang@diamond.ac.uk>

base_classes/NXcalibration.nxdl.xml

@@ -82,7 +82,7 @@
     </field>
     <field name="original_axis" type="NX_FLOAT" units="NX_ANY">
         <doc>
-             Vector containing the data coordinates in the original uncalibrated axis
+             Array containing the data coordinates in the original uncalibrated axis
         </doc>
         <dimensions rank="1">
             <dim index="1" value="ncal"/>
@@ -124,7 +124,7 @@
     </group>
     <group name="coefficients" type="NXparameters">
         <doc>
-             For non-linear energy calibrations, e.g. in a TOF, a polynomial function is fit
+             For non-linear energy calibrations, e.g. in a TOF, a polynomial function is fitted
              to a set of features (peaks) at well defined energy positions to determine
              E(TOF). Here we can store the fit coefficients.
         </doc>