Extension validation config

[ecklie]

Separate section with some more details around extension allowlists

[github-actions]

Linting Errors

• guides/multitenancy/mtxs.md:1119 Fenced code blocks should have a language specified

[github-actions]

Suggested change

	```
	```txt
	@restrict
	@requires
	@readonly
	@mandatory
	@assert.*
	@cds.persistence.*
	@sql.append
	@sql.prepend
	@path
	@impl
	@cds.autoexpose
	@cds.api.ignore
	@odata.etag
	@cds.query.limit
	@cds.localized
	@cds.valid.*
	@cds.search
	```

Please add a language tag. For plain text add txt as language tag.

[swaldmann]

Calling it "Extension Restrictions" above in L813 ;)

Suggested change

	### Extension Restriction
	### Extension Restrictions

[swaldmann]

Suggested change

	You can restrict what parts of the application model can be extended by the SaaS Customer.
	You can restrict what parts of the application model can be extended by the SaaS customer.

[swaldmann]

Shorter:

Suggested change

	> As soon as an `extension-allowlist` is present, extensions are forbidden, except those that are listed
	in the `extension-allowlist`.
	> If an `extension-allowlist` is defined, only the configured extensions are allowed.

[swaldmann]

Suggested change

	By adding services to the `extension-allowlist`, services are enabled for extensions by Saas Customers.
	By adding services to the `extension-allowlist`, services are enabled for extensions by Saas customers.

[swaldmann]

Suggested change

	In addition, you can restrict the number of bound entities by setting a number for "new-entites".
	In addition, you can restrict the number of bound entities by setting a limit for "new-entites".

[swaldmann]

👍 just a few minor things