docs: fix two typos in Key Management Cheat Sheet

[krithikashree1957]

…Management Cheat Sheet

You're A Rockstar

Thank you for submitting a Pull Request (PR) to the Cheat Sheet Series.

🚩 If your PR is related to grammar/typo mistakes, please double-check the file for other mistakes in order to fix all the issues in the current cheat sheet.

Please make sure that for your contribution:

• In case of a new Cheat Sheet, you have used the Cheat Sheet template.
• All the markdown files do not raise any validation policy violation, see the policy.
• [ x ] All the markdown files follow these format rules.
• [ x ] All your assets are stored in the assets folder.
• All the images used are in the PNG format.
• Any references to websites have been formatted as [TEXT](URL)
• You verified/tested the effectiveness of your contribution (e.g., the defensive code proposed is really an effective remediation? Please verify it works!).
• [ x ] The CI build of your PR pass, see the build status here.

Scope and sourcing (required)

• [ x ] This PR is focused: it modifies a single cheat sheet, or a small coordinated set, and the scope is described in the PR body.
• Every technical claim, recommendation, or threat assertion added in this PR is supported by a primary source (RFC, NIST, OWASP standard, vendor documentation, peer-reviewed research) linked inline as [text](URL).
• I have read each source I cite and confirm it actually supports the claim. I have not relied on summaries, hearsay, or model-generated citations.

If your PR is related to an issue, please finish your PR text with the following line:

This PR fixes issue #<REPLACE WITH ISSUE NUMBER>.

AI Tool Usage Disclosure (required for all PRs)

Please select exactly one of the following options. PRs that leave this section blank will be closed.

• [ x ] I have NOT used any AI tool to generate the contents of this PR.
• I have used AI tools to generate the contents of this PR. I have verified
  the contents and I affirm the results. The LLM used is [llm name and version]
  and the prompt used is [your prompt here]. I have independently verified every citation and technical claim against the cited source. [Feel free to add more details if needed]

Thank you again for your contribution 😃