Further overhaul of package line comments.

core/path/filepath/path.odin

@@ -1,4 +1,4 @@
-// package filepath package uses either forward slashes or backslashes depending on the operating system.
+// Process paths using either forward slashes or backslashes depending on the operating system.
 // To process paths such as URLs that depend on forward slashes regardless of the OS, use the slashpath package.
 package filepath
 

core/path/slashpath/path.odin

@@ -1,4 +1,4 @@
-// package slashpath is only to be used for paths separated by forward slashes, e.g. paths in URLs.
+// Process paths separated by forward slashes only, e.g. paths in `URL`s.
 //
 // This package does not deal with Windows/NT paths with volume letters or backslashes
 // To manipulate operating system specific paths, use the path/filepath package