clarify M1 installation instructions (#34505)

A few folks have been confused by the order of the installation instructions for M1, so adding some clarifying language. While I was at it, I made minor improvements to some language in nearby paragraphs.

doc/source/ray-contribute/docs.ipynb

@@ -28,28 +28,27 @@
     "cd ray/doc\n",
     "```\n",
     "\n",
-    "**Note**: If you are on an Apple Silicon (M1) read the instructions below for installing the dependencies.\n",
+    "**Note**: If you are using Apple Silicon (M1), follow the instructions below before continuing.\n",
     "\n",
-    "Make sure you activate the Python environment you are using (e.g. venv, conda, etc.) and then to install the documentation dependencies, run the following command:\n",
+    "Activate the Python environment you are using (e.g., venv, conda, etc.). Install the documentation dependencies, with the following command:\n",
     "\n",
     "```shell\n",
     "pip install -r requirements-doc.txt\n",
     "```\n",
     "\n",
-    "Additionally, it's best if you install the dependencies for our linters with\n",
+    "Install the dependencies for our linters to ensure your changes comply with our style guide.\n",
     "\n",
     "```shell\n",
     "pip install -r ../python/requirements_linters.txt\n",
     "```\n",
     "\n",
-    "so that you can make sure your changes comply with our style guide.\n",
-    "Building the documentation is done by running the following command:\n",
+    "Build the documentation by running the following command:\n",
     "\n",
     "```shell\n",
     "make develop\n",
     "```\n",
     "\n",
-    "which will build the documentation into the `_build` directory.\n",
+    "Find the documentation build in the `_build` directory.\n",
     "After the build finishes, you can simply open the `_build/html/index.html` file in your browser.\n",
     "It's considered good practice to check the output of your build to make sure everything is working as expected.\n",
     "\n",