update src folder link

[Arhell]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌

resolve https://github.com/yiisoft/arrays/issues/147

[what-the-diff[bot]]

PR Summary

• Updated Link to PHP Manual in Comment The pull request includes an change to a comment within the code. This modification isn't altering the program at all, but improving the documentation for developers by updating the link to the relevant PHP manual. This will offer a more secure connection when visiting the manual due to change of protocol from 'http' to 'https'.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (40eec85) 99.76% compared to head (4b8b3aa) 99.76%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #148 +/- ## ========================================= Coverage 99.76% 99.76% Complexity 212 212 ========================================= Files 4 4 Lines 422 422 ========================================= Hits 421 421 Misses 1 1 ```

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