broken link in core_memory.html to core.GC.free

## kdevel reported this on 2022-01-19T19:43:42Z

### Transfered from https://issues.dlang.org/show_bug.cgi?id=22690

### Description

````markdown
https://dlang.org/phobos/core_memory.html#.__delete contains a link named "core.GC.free" which points to https://dlang.org/phobos/core_GC.html#.free resulting in "Oh No! Page Not Found".
````