Add comments to TenancyMailManager, rename property

src/TenancyMailManager.php

@@ -5,16 +5,42 @@ declare(strict_types=1);
 namespace Stancl\Tenancy; // todo new Overrides namespace?
 
 use Illuminate\Mail\MailManager;
+use Stancl\Tenancy\Bootstrappers\MailTenancyBootstrapper;
 
+/**
+ * This class (paired with the MailTenancyBootstrapper)
+ * allows tenants to have their custom mailer credentials.
+ *
+ * Tenancy swaps Laravel's MailManager singleton for an instance of this class,
+ * which overrides the manager's get method to always resolve
+ * the mailers specified in the static $mailersToAlwaysResolve property
+ * instead of getting them from the $mailers property where they're cached.
+ *
+ * This is mainly used to solve the issue where
+ * mail gets sent with the incorrect (old) mailer credentials
+ * due to the mailer being cached in the manager's $mailers property
+ * and not getting updated when the tenant's credentials change.
+ *
+ * @see MailTenancyBootstrapper
+ */
 class TenancyMailManager extends MailManager
 {
-    public static array $mailersToNotCache = [
+    /**
+     * Names of mailers which will always get re-resolved even when they're
+     * cached & available in the $mailers property.
+     */
+    public static array $mailersToAlwaysResolve = [
         'smtp',
     ];
 
+    /**
+     * Override the get method so that the mailers in $mailersToAlwaysResolve
+     * always get resolved even when they're cached and available in the $mailers property
+     * for the mailers to have the up-to-date tenant credentials.
+     */
     protected function get($name)
     {
-        if (in_array($name, static::$mailersToNotCache)) {
+        if (in_array($name, static::$mailersToAlwaysResolve)) {
             return $this->resolve($name);
         }