[sqlserver] [skip ci] warn users about % char in yaml (#2604)
[sqlserver] [skip ci] warn users about % char in yaml (#2604)

* [sqlserver] [skip ci] warn users about % char in yaml

The '%' character must be escaped as '%%' for adodbapi to make a
correct connection_string. Adding a comment to warn users in the
sqlserver.yaml.example file.

Only a comment, so [skip ci] is appropriate.

indeedops/dd-agent,takus/dd-agent,jyogi/purvar-agent,takus/dd-agent,cberry777/dd-agent,indeedops/dd-agent,jyogi/purvar-agent,jyogi/purvar-agent,Wattpad/dd-agent,cberry777/dd-agent,Wattpad/dd-agent,manolama/dd-agent,Wattpad/dd-agent,jyogi/purvar-agent,Wattpad/dd-agent,Wattpad/dd-agent,manolama/dd-agent,takus/dd-agent,manolama/dd-agent,indeedops/dd-agent,cberry777/dd-agent,manolama/dd-agent,cberry777/dd-agent,indeedops/dd-agent,cberry777/dd-agent,takus/dd-agent,indeedops/dd-agent,jyogi/purvar-agent,takus/dd-agent,manolama/dd-agent