Fix link in README

[stanleegoodspeed]

What does this PR do?

This removes the french page prefix/fr from the ASM directions

Motivation

I noticed this when going through the enabledASM instructions on the docs site and I was redirected to the french translation site https://docs.datadoghq.com/serverless/libraries_integrations/plugin/

Testing Guidelines

Additional Notes

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (78f2eb9) 76.33% compared to head (20dc141) 76.33%.

❗ Current head 20dc141 differs from pull request most recent head a5a7a28. Consider uploading reports for the commit a5a7a28 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #458   +/-   ##
=======================================
  Coverage   76.33%   76.33%           
=======================================
  Files          12       12           
  Lines         955      955           
  Branches      299      299           
=======================================
  Hits          729      729           
  Misses        164      164           
  Partials       62       62           

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[purple4reina]

Thanks for catching this!