tikv: fix the description of in-memory-engine.capacity

[hfxsd]

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• This PR is translated from: tikv: fix the description of in-memory-engine.capacity docs-cn#21475
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[gemini-code-assist]

Code Review

This pull request adds a temporary file temp.md containing test text. The reviewer identified that this file is unrelated to the pull request's objective of fixing the description for in-memory-engine.capacity and requested its removal.

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temp.md (1)

This file appears to be a temporary test file and seems unrelated to the pull request's stated goal, which is to "fix the description of in-memory-engine.capacity". Please remove this file and commit the intended changes for the documentation.