PR #12951: Update PJRT C API readme to link to header
PR #12951: Update PJRT C API readme to link to header

Imported from GitHub PR https://github.com/openxla/xla/pull/12951


Copybara import of the project:

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edab0ad80b2c2cdc5d7debcb5dc1511de76a3908 by Skye Wanderman-Milne <skyewm@google.com>:

Update PJRT C API readme to link to header

Merging this change closes #12951

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12951 from skye:patch-2 edab0ad80b2c2cdc5d7debcb5dc1511de76a3908
