Remove the "::" separator from the SEPARATORS_REGEXP in searcher.js

[chaitanyarahalkar]

Should fix #2463

Tried searching for std::min and was able to get good C++ documentation results.

The issue was in the search query normalization process. When you searched for "std::min", the "::" (scope resolution operator in C++) was being replaced with a separator character, which prevented the search from matching C++ symbols correctly.

I removed the "::" pattern from the SEPARATORS_REGEXP regular expression in the searcher.js file. This change allows the search functionality to preserve the C++ scope resolution operator (::) when processing search queries.