Fix spelling mistakes and fix grammar issues

There are numerous grammatical errors and issues with capitalization. This proposed update fixes those issues, and makes the page look nicer overall.

app.py

@@ -68,12 +68,12 @@ with block:
         with gr.Column():
             input_image = gr.Image(source='upload', type="pil")
             depth_image = gr.Image(
-                source='upload', type="pil", label="Depth image Optional", value=None)
+                source='upload', type="pil", label="Depth Image Optional", value=None)
             prompt = gr.Textbox(label="Prompt")
-            negative_prompt = gr.Textbox(label="Negative Pompt")
+            negative_prompt = gr.Textbox(label="Negative Prompt")
 
             run_button = gr.Button(label="Run")
-            with gr.Accordion("Advanced options", open=False):
+            with gr.Accordion("Advanced Options", open=False):
                 num_samples = gr.Slider(
                     label="Images", minimum=1, maximum=4, value=1, step=1)
                 steps = gr.Slider(label="Steps", minimum=1,
@@ -92,7 +92,7 @@ with block:
                     randomize=True,
                 )
         with gr.Column():
-            gallery = gr.Gallery(label="Generated images", show_label=False).style(
+            gallery = gr.Gallery(label="Generated Images", show_label=False).style(
                 grid=[2], height="auto")
     gr.Examples(
         examples=[