docs: fix session wording in docs

[Rohan5commit]

Summary

• normalize reuse wording in the session documentation examples

Related issue

• N/A (trivial docs fix)

Guideline alignment

• Reviewed https://github.com/httpie/cli/blob/master/CONTRIBUTING.md and kept this to one documentation file with no behavior change.

Validation/testing note

• Not run (documentation-only change)

[Copilot]

Pull request overview

This PR normalizes wording in the HTTPie sessions documentation to consistently use “reuse/reused” instead of “re-use/re-used”, and removes a trailing blank line at the end of the doc.

Changes:

• Update session example comment to “Reuse the existing session …”.
• Update anonymous sessions text to “reused across multiple hosts”.
• Remove trailing whitespace/blank line at the end of the file.

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