doc: enhance clarification about the main field

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: SuperMo0

doc/api/packages.md

@@ -1012,7 +1012,7 @@ added: v0.4.0
 The `"main"` field defines the entry point of a package when imported by name
 via a `node_modules` lookup.  Its value is a path.
 
-the [`"exports"`][] field, if it exists, will take precedence over the
+The [`"exports"`][] field, if it exists, will take precedence over the
 `"main"` field when importing the package by name.
 
 It also defines the script that is used when the [package directory is loaded