corrects guide name in template

common/lib/xmodule/xmodule/templates/problem/formularesponse.yaml

@@ -9,8 +9,8 @@ data: |
   mathematical expression into a field, and text is converted to a symbolic
   expression that appears below that field. You can refer learners to
   <a href="http://edx.readthedocs.io/projects/edx-guide-for-students/en/latest/completing_assignments/SFD_mathformatting.html" target="_blank">
-  Entering Mathematical and Scientific Expressions</a> in the <i>EdX Guide for
-  Students</i> for information about how to enter text into the field.
+  Entering Mathematical and Scientific Expressions</a> in the <i>EdX Learner's
+  Guide</i> for information about how to enter text into the field.
   </p>
   <p>
   Math expression problems can include unknown variables and relatively