[Docs] Update getting-started.asciidoc (#29294)
[Docs] Update getting-started.asciidoc (#29294)

Description after first use of search API with body does not refer to verb POST.
robin13/elasticsearch,robin13/elasticsearch,uschindler/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,gfyoung/elasticsearch,nknize/elasticsearch,GlenRSmith/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,robin13/elasticsearch,gingerwizard/elasticsearch,gingerwizard/elasticsearch,coding0011/elasticsearch,scorpionvicky/elasticsearch,HonzaKral/elasticsearch,GlenRSmith/elasticsearch,coding0011/elasticsearch,rajanm/elasticsearch,rajanm/elasticsearch,gingerwizard/elasticsearch,gingerwizard/elasticsearch,gfyoung/elasticsearch,gingerwizard/elasticsearch,uschindler/elasticsearch,scorpionvicky/elasticsearch,nknize/elasticsearch,HonzaKral/elasticsearch,nknize/elasticsearch,rajanm/elasticsearch,gfyoung/elasticsearch,gfyoung/elasticsearch,rajanm/elasticsearch,GlenRSmith/elasticsearch,rajanm/elasticsearch,scorpionvicky/elasticsearch,scorpionvicky/elasticsearch,scorpionvicky/elasticsearch,nknize/elasticsearch,nknize/elasticsearch,coding0011/elasticsearch,uschindler/elasticsearch,GlenRSmith/elasticsearch,uschindler/elasticsearch,coding0011/elasticsearch,HonzaKral/elasticsearch,uschindler/elasticsearch,rajanm/elasticsearch,GlenRSmith/elasticsearch,coding0011/elasticsearch,gfyoung/elasticsearch,robin13/elasticsearch