Update description

This addresses the concerns raised in #837.
Namely, the value returned by `os.arch` is the CPU architecture for
which the Node.js binary was compiled, which may **not** be the same
as the actual host CPU architecture (e.g., if a binary is run on
a different architecture).

This commit aims to address the ambiguity of the previous description.

Author: kgryte

lib/node_modules/@stdlib/os/arch/README.md

@@ -20,7 +20,7 @@ limitations under the License.
 
 # Architecture
 
-> Operating system CPU architecture.
+> Operating system CPU architecture for which the JavaScript runtime binary was compiled.
 
 <section class="usage">
 
@@ -32,7 +32,7 @@ var ARCH = require( '@stdlib/os/arch' );
 
 #### ARCH
 
-Operating system CPU architecture.
+Operating system CPU architecture for which the JavaScript runtime binary was compiled.
 
 ```javascript
 console.log( ARCH );

lib/node_modules/@stdlib/os/arch/docs/repl.txt

@@ -1,6 +1,7 @@
 
 {{alias}}
-    Operating system CPU architecture.
+    Operating system CPU architecture for which the JavaScript runtime binary
+    was compiled.
 
     Current possible values:
 

lib/node_modules/@stdlib/os/arch/docs/types/index.d.ts

@@ -19,7 +19,7 @@
 // TypeScript Version: 2.0
 
 /**
-* Operating system CPU architecture.
+* Operating system CPU architecture for which the JavaScript runtime binary was compiled.
 *
 * ## Notes
 *

lib/node_modules/@stdlib/os/arch/lib/index.js

@@ -19,7 +19,7 @@
 'use strict';
 
 /**
-* Operating system CPU architecture.
+* Operating system CPU architecture for which the JavaScript runtime binary was compiled.
 *
 * @module @stdlib/os/arch
 *

lib/node_modules/@stdlib/os/arch/lib/main.js

@@ -26,7 +26,7 @@ var proc = require( 'process' );
 // MAIN //
 
 /**
-* Operating system CPU architecture.
+* Operating system CPU architecture for which the JavaScript runtime binary was compiled.
 *
 * @constant
 * @type {string}

lib/node_modules/@stdlib/os/arch/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@stdlib/os/arch",
   "version": "0.0.0",
-  "description": "Operating system CPU architecture.",
+  "description": "Operating system CPU architecture for which the JavaScript runtime binary was compiled.",
   "license": "Apache-2.0",
   "author": {
     "name": "The Stdlib Authors",