HMR story is pointing wrong configuration

[carlos-algms]

Currently it saying that we should put the configuration withing "server" section:

"serve": {
  "configuration": {
    "hmr": {
      "hmr": true,
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.hmr.ts"
        }
      ]
    }
  }
}

But it is not allowed, due to schema validation:

And it is breaking with a not so friendly error, because the "path" is empty:
(actually it should be a bug, because every wrong key, breaks with an empty path error)

Schema validation failed with the following errors:
  Data path "" should NOT have additional properties(fileReplacements).

The correct location should be within "build" section:

And under server section only:

"serve": {
  "configurations": {
      "hmr": {
          "hmr": true
      }
  }
}

Angular version: 6.0.3
Angular CLI version: 6.0.3

Please submit a PR and sign the CLA.

[carlos-algms]

@robertbaker It is on the wiki page, https://github.com/angular/angular-cli/wiki/stories-configure-hmr

I don't know if it is possible to submit a PR to the project WIKI.

[carlos-algms]

Also, I'm pretty sure that this PR will fix it:
#11029

[robert-claypool]

See also #11121

[filipesilva]

Closed via #11029

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