[SD3 Docs] Corrected title about loading model with T5 "without" -> "with" (huggingface#8602)

[SD3 Docs] Corrected title about loading model with T5

Corrected the documentation title to "Loading the single file checkpoint with T5" Previously, it incorrectly stated "Loading the single file checkpoint without T5" which contradicted the code snippet showing how to load the SD3 checkpoint with the T5 model

Author: RamosCSV

docs/source/en/api/pipelines/stable_diffusion/stable_diffusion_3.md

@@ -249,7 +249,7 @@ image = pipe("a picture of a cat holding a sign that says hello world").images[0
 image.save('sd3-single-file.png')
 ```
 
-### Loading the single file checkpoint without T5
+### Loading the single file checkpoint with T5
 
 ```python
 import torch