Update openxr-cookbook.md

[rpavlik]

Suggest an additional way that does not require accumulating a pose.

[prmerger-automator[bot]]

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 936d003:

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 1f19efb:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
mixed-reality-docs/mr-dev-docs/develop/native/openxr-cookbook.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel