…nts (#43216)

Now JSON files should be commented using

```
// #docregion
```

rather than

```
/* #docregion */
```

There are currently no JSON files with either kind of comments so this change
has no impact yet.

But when we add some examples with such comments, they will also benefit
from `// ... ` style docplasters to join docregion fragments.

PR Close #43216

…egion (#43216)

This change makes docplaster markers fit better with the surrounding code
that is being rendered.  Instead of:

```
{
  "a": 100,
// ...
  "b": 200,
// ...
}
```

you can now get

```
{
  "a": 100,
  // ...
  "b": 200,
  // ...
}
```

PR Close #43216

 1�743216)

It is now possible to specify file paths in the `"boilerplate-override"`
property of `example-config.json` files to tell the example boilerplate
system to use the file in the example directory rather than overwriting the
example file with that from the boilerplate directory.

PR Close #43216

Note that because `angular.json` is a "boilerplate" file we cannot
just add comments to the one that is actually used in the application.

Instead this commit makes a copy, which is annotated with docregions.
To ensure that this file is not ignored by the example-collector, we had to
update the `.gitignore` to not ignore this file. (This also allows the file to be
easily stored tracked in git).

PR Close #43216

PR Close #43216

PR Close #43216

PR Close #43216

This commit tells the docregion parser how to process files that end in `.conf`.

PR Close #43216

PR Close #43216

PR Close #43216

…nts (#43216)

Now JSON files should be commented using

```
// #docregion
```

rather than

```
/* #docregion */
```

There are currently no JSON files with either kind of comments so this change
has no impact yet.

But when we add some examples with such comments, they will also benefit
from `// ... ` style docplasters to join docregion fragments.

PR Close #43216

…egion (#43216)

This change makes docplaster markers fit better with the surrounding code
that is being rendered.  Instead of:

```
{
  "a": 100,
// ...
  "b": 200,
// ...
}
```

you can now get

```
{
  "a": 100,
  // ...
  "b": 200,
  // ...
}
```

PR Close #43216

 1�743216)

It is now possible to specify file paths in the `"boilerplate-override"`
property of `example-config.json` files to tell the example boilerplate
system to use the file in the example directory rather than overwriting the
example file with that from the boilerplate directory.

PR Close #43216

Note that because `angular.json` is a "boilerplate" file we cannot
just add comments to the one that is actually used in the application.

Instead this commit makes a copy, which is annotated with docregions.
To ensure that this file is not ignored by the example-collector, we had to
update the `.gitignore` to not ignore this file. (This also allows the file to be
easily stored tracked in git).

PR Close #43216