Document SSL CA bundle configuration

[MukundaKatta]

Closes #37

Summary

• expand the Python README SSL note into a short CA bundle subsection
• document default disabled verification, ONTAP_VERIFY_SSL=true, and REQUESTS_CA_BUNDLE
• link to the troubleshooting guide SSL / TLS errors section

Verification

• make install && make lint
• rg -n "^## SSL / TLS Errors" docs/troubleshooting.md
• git diff --check

[github-actions]

Test Report skipped — this PR is labelled docs-only. Re-evaluation will run automatically if that label is removed or the PR scope expands to touch python/, ansible/, or terraform/.

[github-actions]

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