Release gwas-ui documentation changes for new formatter and validator

[eks-ebi]

I have edited the following gwas-ui documentation pages:

• https://github.com/EBISPOT/gwas-ui/blob/documentation/goci-interfaces/goci-ui/src/main/docs/summary-statistics-format-content.adoc
• https://github.com/EBISPOT/gwas-ui/blob/documentation/goci-interfaces/goci-ui/src/main/docs/submission-content.adoc

The changes include new links to the formatter/validator documentation and SSF-morph. These should be released to the production as soon as possible.