test: explain sloppy mode for test-global

Add a comment explaining why test-global runs in sloppy mode rather than
strict mode. While in the file, make some minor changes to the module
ordering and spacing to conform with our test writing guide. Also
reordered arguments in `assert.strictEqual()` to match documentation.

test/parallel/test-global.js

@@ -19,28 +19,32 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+// This test cannot run in strict mode because it tests that `baseFoo` is
+// treated as a global without being declared with `var`/`let`/`const`.
+
 /* eslint-disable strict */
 const common = require('../common');
-const path = require('path');
+
 const assert = require('assert');
+const path = require('path');
 
 common.globalCheck = false;
 
 baseFoo = 'foo'; // eslint-disable-line no-undef
 global.baseBar = 'bar';
 
-assert.strictEqual('foo', global.baseFoo,
+assert.strictEqual(global.baseFoo, 'foo',
                    'x -> global.x in base level not working');
 
-assert.strictEqual('bar',
-                   baseBar, // eslint-disable-line no-undef
+assert.strictEqual(baseBar, // eslint-disable-line no-undef
+                   'bar',
                    'global.x -> x in base level not working');
 
 const mod = require(path.join(common.fixturesDir, 'global', 'plain'));
 const fooBar = mod.fooBar;
 
-assert.strictEqual('foo', fooBar.foo, 'x -> global.x in sub level not working');
+assert.strictEqual(fooBar.foo, 'foo', 'x -> global.x in sub level not working');
 
-assert.strictEqual('bar', fooBar.bar, 'global.x -> x in sub level not working');
+assert.strictEqual(fooBar.bar, 'bar', 'global.x -> x in sub level not working');
 
 assert.strictEqual(Object.prototype.toString.call(global), '[object global]');