Add documentation for 𝑒 (aka e)

Author: lizmat

doc/Language/terms.pod6

@@ -179,9 +179,13 @@ of a circle. The ASCII equivalent of C<τ> is C<tau>.
 Returns the number C<τ>, i.e., the ratio between circumference and radius
 of a circle. C<tau> is the ASCII equivalent of C<τ>.
 
+=head2 term 𝑒
+
+Returns Euler's number.  The ASCII equivalent of C<𝑒> is <e>.
+
 =head2 term e
 
-Returns Euler's number.
+Returns Euler's number.  C<e> is the ASCII equivalent of C<𝑒>.
 
 =head2 term i