[llvm] Improve description of what is considered a security issue (PR #147035)

[Peter Smith via llvm-commits]

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@@ -204,6 +204,11 @@ The LLVM Security Policy may be changed by majority vote of the LLVM Security Re
 What is considered a security issue?
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+Below, with "security-sensitive", we mean that a discovered bug or vulnerability
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smithp35 wrote:

Some possible alternatives for wording.

We define "security-sensitive" to mean that a discovered bug or vulnerability may require coordinated disclosure, and therefore should be ...

perhaps even "vulnerability is serious enough to require coordinated disclosure."

https://github.com/llvm/llvm-project/pull/147035