disagreement between the detailed text and the table/figure regarding `effect_size`

[yfarjoun]

The figure and the table refer to beta/odds_ratio/hazard_ratio' while the detailed text says thateffect_size` will be the name of the column while the details will be in the metadata.

[jdhayhurst]

@yfarjoun updated text https://github.com/EBISPOT/gwas-summary-statistics-standard/blob/59d505b1fda80671e35accb230f4ea15826d28f9/gwas-ssf_v0.1.tex#L130

Regenerated pdf to reflect all the changes in tex file.

[jdhayhurst]

Merged suggestion.