Docs: Use single-node discovery.type for dev example
Docs: Use single-node discovery.type for dev example

For the single node, dev example, the `discovery.type=single-node`[1],[2] 
is a perfect fit and makes the example shorter and more self explanatory.

Also expose the transport port, to help with dev use-cases using the 
transport client.

[1] https://github.com/elastic/elasticsearch/pull/23595
[2] https://github.com/elastic/elasticsearch/pull/23598

Relates #26289

ThiagoGarciaAlves/elasticsearch,nknize/elasticsearch,coding0011/elasticsearch,pozhidaevak/elasticsearch,coding0011/elasticsearch,masaruh/elasticsearch,wangtuo/elasticsearch,wangtuo/elasticsearch,maddin2016/elasticsearch,ThiagoGarciaAlves/elasticsearch,qwerty4030/elasticsearch,wenpos/elasticsearch,pozhidaevak/elasticsearch,GlenRSmith/elasticsearch,uschindler/elasticsearch,s1monw/elasticsearch,coding0011/elasticsearch,markwalkom/elasticsearch,wenpos/elasticsearch,robin13/elasticsearch,GlenRSmith/elasticsearch,qwerty4030/elasticsearch,scottsom/elasticsearch,Stacey-Gammon/elasticsearch,coding0011/elasticsearch,rajanm/elasticsearch,scorpionvicky/elasticsearch,HonzaKral/elasticsearch,gingerwizard/elasticsearch,rajanm/elasticsearch,kalimatas/elasticsearch,ThiagoGarciaAlves/elasticsearch,wangtuo/elasticsearch,robin13/elasticsearch,kalimatas/elasticsearch,s1monw/elasticsearch,fred84/elasticsearch,fred84/elasticsearch,rajanm/elasticsearch,mjason3/elasticsearch,uschindler/elasticsearch,GlenRSmith/elasticsearch,s1monw/elasticsearch,robin13/elasticsearch,mjason3/elasticsearch,qwerty4030/elasticsearch,robin13/elasticsearch,Stacey-Gammon/elasticsearch,nknize/elasticsearch,rajanm/elasticsearch,ThiagoGarciaAlves/elasticsearch,kalimatas/elasticsearch,nknize/elasticsearch,qwerty4030/elasticsearch,scottsom/elasticsearch,fred84/elasticsearch,ThiagoGarciaAlves/elasticsearch,HonzaKral/elasticsearch,fred84/elasticsearch,scorpionvicky/elasticsearch,wangtuo/elasticsearch,s1monw/elasticsearch,gingerwizard/elasticsearch,gfyoung/elasticsearch,maddin2016/elasticsearch,robin13/elasticsearch,masaruh/elasticsearch,gingerwizard/elasticsearch,maddin2016/elasticsearch,wangtuo/elasticsearch,scorpionvicky/elasticsearch,masaruh/elasticsearch,gfyoung/elasticsearch,markwalkom/elasticsearch,pozhidaevak/elasticsearch,mjason3/elasticsearch,markwalkom/elasticsearch,gingerwizard/elasticsearch,maddin2016/elasticsearch,wenpos/elasticsearch,HonzaKral/elasticsearch,rajanm/elasticsearch,kalimatas/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,markwalkom/elasticsearch,gfyoung/elasticsearch,scottsom/elasticsearch,scottsom/elasticsearch,uschindler/elasticsearch,pozhidaevak/elasticsearch,mjason3/elasticsearch,kalimatas/elasticsearch,gfyoung/elasticsearch,gingerwizard/elasticsearch,wenpos/elasticsearch,coding0011/elasticsearch,GlenRSmith/elasticsearch,wenpos/elasticsearch,mjason3/elasticsearch,qwerty4030/elasticsearch,Stacey-Gammon/elasticsearch,rajanm/elasticsearch,markwalkom/elasticsearch,nknize/elasticsearch,masaruh/elasticsearch,uschindler/elasticsearch,Stacey-Gammon/elasticsearch,markwalkom/elasticsearch,fred84/elasticsearch,gingerwizard/elasticsearch,maddin2016/elasticsearch,gfyoung/elasticsearch,masaruh/elasticsearch,pozhidaevak/elasticsearch,s1monw/elasticsearch,scottsom/elasticsearch,uschindler/elasticsearch,ThiagoGarciaAlves/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,scorpionvicky/elasticsearch,Stacey-Gammon/elasticsearch,nknize/elasticsearch