doc: rename for clarity

Author: GeoffreyBooth

doc/api/esm.md

@@ -455,7 +455,7 @@ ignores) the top-level `"module"` field.
 
 Node.js can now run ES module entry points, and a package can contain both
 CommonJS and ES module entry points (either via separate specifiers such as
-`'pkg'` and `'pkg/module'`, or both at the same specifier via [Conditional
+`'pkg'` and `'pkg/es-module'`, or both at the same specifier via [Conditional
 Exports][] with the `--experimental-conditional-exports` flag). Unlike in the
 scenario where `"module"` is only used by bundlers, or ES module files are
 transpiled into CommonJS on the fly before evaluation by Node.js, the files
@@ -465,20 +465,21 @@ referenced by the ES module entry point are evaluated as ES modules.
 
 When an application is using a package that provides both CommonJS and ES module
 sources, there is a risk of certain bugs if both versions of the package get
-loaded. This potential comes from the fact that the `pkg` created by `const pkg
-= require('pkg')` is not the same as the `pkg` created by `import pkg from
-'pkg'` (or an alternative main path like `'pkg/module'`). This is the “dual
-package hazard,” where two versions of the same package can be loaded within the
-same runtime environment. While it is unlikely that an application or package
-would intentionally load both versions directly, it is common for an application
-to load one version while a dependency of the application loads the other
-version. This hazard can happen because Node.js supports intermixing CommonJS
-and ES modules, and can lead to unexpected behavior.
+loaded. This potential comes from the fact that the `pkgInstance` created by
+`const pkgInstance = require('pkg')` is not the same as the `pkgInstance`
+created by `import pkgInstance from 'pkg'` (or an alternative main path like
+`'pkg/module'`). This is the “dual package hazard,” where two versions of the
+same package can be loaded within the same runtime environment. While it is
+unlikely that an application or package would intentionally load both versions
+directly, it is common for an application to load one version while a dependency
+of the application loads the other version. This hazard can happen because
+Node.js supports intermixing CommonJS and ES modules, and can lead to unexpected
+behavior.
 
 If the package main export is a constructor, an `instanceof` comparison of
 instances created by the two versions returns `false`, and if the export is an
-object, properties added to one (like `pkg.foo = 3`) are not present on the
-other. This differs from how `import` and `require` statements work in
+object, properties added to one (like `pkgInstance.foo = 3`) are not present on
+the other. This differs from how `import` and `require` statements work in
 all-CommonJS or all-ES module environments, respectively, and therefore is
 surprising to users. It also differs from the behavior users are familiar with
 when using transpilation via tools like [Babel][] or [`esm`][].