Section 3.6.1: Transient Execution. Add example related to Store-Bypass-Load (Spectre v4)

[swarnpriya]

It would be nice to have a link to the names of Sectre Attacks. For example, in the case of branch prediction, a reference to Spectre v1 attacks. In the case of the store-bypass-load scenario, a reference to Spectre v4 attacks. Similarly, in the case of indirect branch prediction, a reference to Spectre v2.
Adding one example showcasing the Spectre v4 attack as in the text, there is a discussion about it.