add more grid layout options

docs/components/forms.md

@@ -392,6 +392,55 @@ Be sure to add `.col-form-label` to your `<label>`s as well so they're verticall
 </div>
 {% endexample %}
 
+More complex layouts can also be created with the grid system.
+
+{% example html %}
+<div class="container">
+  <form>
+    <div class="row">
+      <div class="form-group col-md-6">
+        <label for="inputEmail4" class="col-form-label">Email</label>
+        <input type="email" class="form-control" id="inputEmail4" placeholder="Email">
+      </div>
+      <div class="form-group col-md-6">
+        <label for="inputPassword4" class="col-form-label">Password</label>
+        <input type="password" class="form-control" id="inputPassword4" placeholder="Password">
+      </div>
+    </div>
+    <div class="form-group">
+      <label for="inputAddress" class="col-form-label">Address</label>
+      <input type="text" class="form-control" id="inputAddress" placeholder="1234 Main St">
+    </div>
+    <div class="form-group">
+      <label for="inputAddress2" class="col-form-label">Address 2</label>
+      <input type="text" class="form-control" id="inputAddress2" placeholder="Apartment, studio, or floor">
+    </div>
+    <div class="row">
+      <div class="form-group col-md-6">
+        <label for="inputCity" class="col-form-label">City</label>
+        <input type="text" class="form-control" id="inputCity">
+      </div>
+      <div class="form-group col-md-4">
+        <label for="inputState" class="col-form-label">State</label>
+        <select id="inputState" class="form-control">Choose</select>
+      </div>
+      <div class="form-group col-md-2">
+        <label for="inputZip" class="col-form-label">Zip</label>
+        <input type="text" class="form-control" id="inputZip">
+      </div>
+    </div>
+    <div class="form-group">
+      <div class="form-check">
+        <label class="form-check-label">
+          <input class="form-check-input" type="checkbox"> Check me out
+        </label>
+      </div>
+    </div>
+    <button type="submit" class="btn btn-primary">Sign in</button>
+  </form>
+</div>
+{% endexample %}
+
 Grid-based form layouts also support large and small inputs.
 
 {% example html %}
@@ -413,7 +462,6 @@ Grid-based form layouts also support large and small inputs.
 </div>
 {% endexample %}
 
-
 ## Checkboxes and radios
 
 Default checkboxes and radios are improved upon with the help of `.form-check`, **a single class for both input types that improves the layout and behavior of their HTML elements**. Checkboxes are for selecting one or several options in a list, while radios are for selecting one option from many.