Fix build-doc CI failure debuged in Lightning-AI#5329

Author: tarepan

pytorch_lightning/trainer/trainer.py

@@ -251,8 +251,7 @@ def __init__(
                 you can set ``replace_sampler_ddp=False`` and add your own distributed sampler.
 
             resume_from_checkpoint: To resume training from a specific checkpoint pass in the path here.
-                This can be a URL.
-                If there is no checkpoint file at the specified path, start training from scratch.
+                This can be a URL. If there is no checkpoint file at the path, start from scratch.
 
             sync_batchnorm: Synchronize batch norm layers between process groups/whole world.