Update contributed_definitions/NXstress.nxdl.xml

Co-authored-by: Aaron S. Brewster <asbrewster@lbl.gov>

contributed_definitions/NXstress.nxdl.xml

@@ -73,7 +73,7 @@
  file, that they are stored only in one location and then linked in the other instances. For example, if during an acquisition all
  instrumental parameters but one stay the same and only the sample table moves in one direction (e.g. Xtranslation), then all the
  static instrumental parameters should be saved just once (e.g. in just one NXentry or in a *Shared_Information group*) and their
- vales linked to every *instrument group* under all the other acquistions. The value for the variable that changes, Xtranslation
+ values linked to every *instrument group* under all the other acquisitions. The value for the variable that changes, Xtranslation
  in this example, is suggested to only be saved at every instrument group under each acquistion but not in the *Shared_Information group*.
  It is not always necessary to link each field. In case all the fields with an entire group are the same, the entire group can be linked.
  </doc>