Fix to figure (#52)

* Fix to figure

* Extended description of the Image

The text will become part of the "alt" description of the image in HTML so we should be verbose here for e.g. inclusivity

---------

Co-authored-by: Jan Eufinger <[email protected]>

Author: PMenges

user_docs/assets/img/Submission_overview_page.png

@@ -2,12 +2,12 @@
 
 A submission of data contains the three main steps, please follow the links for further information:
 
-  ![Overview](../../assets/img/Submission_overview_page.png){ width="800" }
+  ![Overview of the Submission Process](../../assets/img/Submission_overview_page.png){ width="800" }
 
 1. Filing a [Pre-Submission Inquiry](https://www.ghga.de/about-us/presubmission-enquiries) or contacting us via the <general:GHGA Helpdesk>
 1. [Agreement of a Data Processing Contract with GHGA Central](dpc_preparation.md)
 1. [Preparing the Data, including Metadata, for submission](submitter_guide.md)
 
 ## Note on Submission Service
 
---8<-- "submission_limitations.md"
+--8<-- "submission_limitations.md"