EES-5917 - Tweak line to api docs for powerBI users

Author: mmoalin

src/explore-education-statistics-api-docs/source/getting-started/building-api-integrations/index.html.md.erb

@@ -17,4 +17,4 @@ develop support for your chosen language or software, [contact us via email](/su
 ## Available SDKs
 
 - for R users - [eesyapi package](https://github.com/dfe-analytical-services/eesyapi)
-- for PowerBi users - [eesyapi.powerbi](https://github.com/dfe-analytical-services/eesyapi.powerbi)
+- for PowerBI users - [eesyapi.powerbi](https://github.com/dfe-analytical-services/eesyapi.powerbi)