Fix typos in POD documentation

Author: dpvc

macros/contexts/contextReaction.pl

@@ -117,9 +117,9 @@ =head1 DESCRIPTION
 correct answer in the form the correct answer is given (molecular or
 condensed structural form).  If you want to allow either form, then
 you can set the flag C<acceptMolecularForm> to C<1>, in which case,
-the student's answwer is compared first to the original correct answer
+the student's answer is compared first to the original correct answer
 and then to its molecular form.  For example, if the correct answer is
-`(NH_4)_3PO_4`, then a student answer of `N_3H_12PO_4` would also be
+C<(NH_4)_3PO_4>, then a student answer of C<N_3H_12PO_4> would also be
 considered correct when this flag is set to C<1>.
 
 You can convert a compound (or every term of a complete reaction) to
@@ -128,7 +128,7 @@ =head1 DESCRIPTION
 
     $R = Compute("CH_3CH_2CH_3")->molecularForm;
 
-would make C<$R> be the quivalent of C<Compute("C_3H_8")>.
+would make C<$R> be the equivalent of C<Compute("C_3H_8")>.
 
 Note that student answers aren't reduced to molecular form when
 C<acceptMolecularForm> is true.  If you want to allow students to