Fix missing word in wipe guide
@@ -23,6 +23,6 @@ Follow these steps to wipe the build environment:
By wiping the documentation build environment, all the `rst`, `md`,
and code files associated with it will be removed but not the
documentation already built (`HTML` and `PDF` files). Your
- documentation will still online after wiping the build environment.
+ documentation will still be online after wiping the build environment.
Now you can re-build the version with a fresh build environment!
