Update the description of primitive

[jyu00]

URL to the relevant guide or resource

https://quantum.cloud.ibm.com/docs/en/guides/primitives#what-is-a-primitive

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There was a feedback that the wording you might want to manipulate electrical signals used in the primitive description gives the wrong impression that we provide that level of access.

Since the section immediately above, Why did Qiskit introduce primitives?, already covers a lot of the reasoning behind, I think we can simplify the What section to something like

In computing, a primitive is the smallest processing instruction for a given abstraction level. Put simply, you can think of primitives as the simplest building block from which one can create something useful for a given abstraction level.

The two most common tasks for quantum computers are sampling quantum states and calculating expectation values. These tasks motivated the design of the Qiskit primitives: Estimator and Sampler.
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For new content requests - if the request is accepted, do you want to write the content?

I can help the team by providing enough information or by referring them to a specific Subject Matter Expert to write the material