Alias multiple paths in template documentation

Thank you for this amazing project!

While learning, I tried to implement a secondary view (template) for a particular node type. Following the example in `templates.md` (https://github.com/gridsome/gridsome.org/blob/master/docs/templates.md / https://gridsome.org/docs/templates/) , I queried both paths:

```
query ($id: ID!) {
product(id: $id) {
path # path to the default template
path(to:"reviews") # path to the reviews template
}
}
```

but this of course does not work. I didn't yet know the concept of aliases in GraphQL, so it may be instructive to either revise the example to include an alias, or do not include `path` twice.

```
path
reviewPath: path(to:"reviews")
```

Kind regards

Start with docs/templates.md and compare the published templates documentation with the reported GraphQL query. Update the example so repeated path fields use an alias, or remove the duplicate field; done means the example is valid and clearly shows how to retrieve both template paths.

Written by the indexing model from the issue text.