autoexpect: add page

[sapbotgit]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

Reference issue: #17737

[tldr-bot]

The build for this PR failed with the following error(s) at commit
8c425d13c9ab8fced2aa619581fd239bf3d67b19:

pages/linux/autoexpect.md:
Error: Parse error on line 4:
...et/man/1/autoexpect>- Spawn shell, and
-----------------------^
Expecting 'END_INFORMATION_LINK_URL', got 'NEWLINE'
pages/linux/autoexpect.md:3: TLDR004 Command descriptions should end in a period
pages/linux/autoexpect.md:4: TLDR011 Page never contains more than a single empty line

Please fix the error(s) and push again.