Export documentation

[salonee13]

I added a line that tells you that you can customize your filename using the Export Filename box. I also added a new screenshot with a picture of the updated export functionality. #2999

What changes were proposed in this pull request?

How was this pull request tested?

Developer's Certificate of Origin 1.1

   By making a contribution to this project, I certify that:

   (a) The contribution was created in whole or in part by me and I
       have the right to submit it under the Apache License 2.0; or

   (b) The contribution is based upon previous work that, to the best
       of my knowledge, is covered under an appropriate open source
       license and I have the right under that license to submit that
       work with modifications, whether created in whole or in part
       by me, under the same open source license (unless I am
       permitted to submit under a different license), as indicated
       in the file; or

   (c) The contribution was provided directly to me by some other
       person who certified (a), (b) or (c) and I have not modified
       it.

   (d) I understand and agree that this project and the contribution
       are public and that a record of the contribution (including all
       personal information I submit with it, including my sign-off) is
       maintained indefinitely and may be redistributed consistent with
       this project or the open source license(s) involved.

[akchinSTC]

@salonee13 - forgot that one last sign off on the last commit, just run a quick git commit -s --amend --no-edit should do it...then force push back into your fork/branch.

[kiersten-stokes]

LGTM! Thanks @salonee13