Update file line terminator from CRLF to LF

[RainbowMango]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:
This PR twists the file line terminator from CRLF to LF.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Find the file with CRLF line terminator:

# find /root/go/src/github.com/karmada-io/website -type f -exec file {} \; | grep -v "vendor" | grep CRLF
/root/go/src/github.com/karmada-io/website/docs/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/docs/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.6/administrator/migration/migration-from-kubefed.md: UTF-8 Unicode text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.10/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.10/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.7/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.9/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.9/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.11/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.11/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/versioned_docs/version-v1.8/administrator/migration/migration-from-kubefed.md: ASCII text, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/i18n/zh/docusaurus-plugin-content-docs/version-v1.10/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/i18n/zh/docusaurus-plugin-content-docs/current/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/i18n/zh/docusaurus-plugin-content-docs/version-v1.9/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators
/root/go/src/github.com/karmada-io/website/i18n/zh/docusaurus-plugin-content-docs/version-v1.11/administrator/security/security-considerations.md: UTF-8 Unicode text, with very long lines, with CRLF line terminators

[zhzhuang-zju]

/lgtm

[karmada-bot]

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