docs: improve build steps comments

Dockerfile

@@ -1,4 +1,4 @@
-#base image
+# base image
 FROM python:3.8
 LABEL org.opencontainers.image.source https://github.com/serengil/deepface
 
@@ -28,11 +28,11 @@ RUN apt-get update
 RUN apt-get install ffmpeg libsm6 libxext6 -y
 
 # -----------------------------------
-# if you will use gpu, then you should install tensorflow-gpu package
+# if you plan to use a GPU, you should install the 'tensorflow-gpu' package
 # RUN pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host=files.pythonhosted.org tensorflow-gpu
 
 # -----------------------------------
-# install deepface from pypi release (might be out-of-the-date)
+# install deepface from pypi release (might be out-of-date)
 # RUN pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host=files.pythonhosted.org deepface
 # -----------------------------------
 # install deepface from source code (always up-to-date)