intel / intel/confidential-computing.tee.dcap

doc: update Intel_TDX_DCAP_Quoting_Library_API.pdf to include the hypercall base flow

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Description

While reading the [latest doc (for 1.21)](https://download.01.org/intel-sgx/sgx-dcap/1.21/linux/docs/Intel_TDX_DCAP_Quoting_Library_API.pdf) I noticed the diagrams do not clearly illustrate the `TDG.VP.VMCALL` based approach that the Linux upstream TD quote driver uses.

Section 2.2.1 sort of talks about it but it's slightly outdated and missing from the diagrams.

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