Update render-to-template.mdx

[justinfernald]

Please describe the changes this PR makes and why it should be merged:

docs/render-to-template for the renderToTemplate function states the syntax should be using stringToDOM but should be renderToTemplate

Status

• [X] Code changes have been tested against prettier, or there are no code changes
• [X] I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• [ ] This PR changes the codebase
  • [ ] This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • [ ] This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• [X] This PR only includes non-code changes, like changes to documentation, README, etc.