Fix link to rest api in import export guide for operator
Fix link to rest api in import export guide for operator

Has to be merged together with the PR for keycloak/keycloak-web#316 to work correctly

Also fixes a few typos in the guide

Closes #11930

raehalme/keycloak,keycloak/keycloak,srose/keycloak,stianst/keycloak,keycloak/keycloak,jpkrohling/keycloak,reneploetz/keycloak,mhajas/keycloak,raehalme/keycloak,hmlnarik/keycloak,reneploetz/keycloak,ahus1/keycloak,hmlnarik/keycloak,raehalme/keycloak,hmlnarik/keycloak,srose/keycloak,stianst/keycloak,raehalme/keycloak,raehalme/keycloak,jpkrohling/keycloak,keycloak/keycloak,mhajas/keycloak,stianst/keycloak,mhajas/keycloak,hmlnarik/keycloak,jpkrohling/keycloak,ahus1/keycloak,jpkrohling/keycloak,mhajas/keycloak,reneploetz/keycloak,keycloak/keycloak,hmlnarik/keycloak,stianst/keycloak,mhajas/keycloak,hmlnarik/keycloak,srose/keycloak,srose/keycloak,jpkrohling/keycloak,abstractj/keycloak,abstractj/keycloak,keycloak/keycloak,stianst/keycloak,srose/keycloak,reneploetz/keycloak,abstractj/keycloak,abstractj/keycloak,ahus1/keycloak,ahus1/keycloak,ahus1/keycloak,ahus1/keycloak,raehalme/keycloak,abstractj/keycloak,reneploetz/keycloak