Documentation about the debugAdapter configuration of debugger is contradictory

[rosti-il]

From #2205 the default value of the debugAdapter configuration is dlv-dap. Following documentation still states in some places that the default value is legacy and in other places that it's dlv-dap

https://github.com/golang/vscode-go/blob/master/docs/debugging.md

For example:

The headless dlv server can now be used with both "debugAdapter": "legacy" (default value) and "debugAdapter": "dlv-dap"

   "debugAdapter": "dlv-dap", // `legacy` by default

debugAdapter: Controls which debug adapter to use (default: legacy).

Please fix this to prevent confusion.

[hyangah]

For remote debugging, "legacy" is still the default.

#3096