chore: add warning message to react-metamask-button example dapp

[christopherferreira9]

Explanation

Adds a warning to the react-metamask-button example dapp since a recent bug found in it is causing the mobile wallet to crash.

This message should be removed once the issue is fixed.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.62%. Comparing base (90f2b7e) to head (282db65).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #924      +/-   ##
==========================================
+ Coverage   86.53%   86.62%   +0.09%     
==========================================
  Files         177      177              
  Lines        3868     3859       -9     
  Branches      952      947       -5     
==========================================
- Hits         3347     3343       -4     
+ Misses        521      516       -5     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud