Update cheatsheets

tldr/pulumi-schema

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pulumi schema
+
+> Check a Pulumi package schema for errors.
+> Schema reference: <https://www.pulumi.com/docs/iac/extending-pulumi/schema/>.
+> More information: <https://www.pulumi.com/docs/iac/cli/commands/pulumi_schema/>.
+
+- Check a package schema:
+
+`pulumi schema check {{path/to/file}}`
+
+- Check a package schema without failing if the reference to a type is missing:
+
+`pulumi schema check --allow-dangling-references {{path/to/file}}`
+
+- Display help:
+
+`pulumi schema check {{[-h|--help]}}`