Use single quotes for consistent style

docs/html/cli/pip_install.rst

@@ -11,11 +11,11 @@ Usage
 
 .. tab:: Unix/macOS
 
-   .. pip-command-usage:: install "python -m pip"
+   .. pip-command-usage:: install 'python -m pip'
 
 .. tab:: Windows
 
-   .. pip-command-usage:: install "py -m pip"
+   .. pip-command-usage:: install 'py -m pip'
 
 
 
@@ -368,7 +368,7 @@ Examples
          python -m pip install -e hg+https://hg.repo/some_pkg.git#egg=SomePackage            # from mercurial
          python -m pip install -e svn+svn://svn.repo/some_pkg/trunk/#egg=SomePackage         # from svn
          python -m pip install -e git+https://git.repo/some_pkg.git@feature#egg=SomePackage  # from 'feature' branch
-         python -m pip install -e "git+https://git.repo/some_repo.git#egg=subdir&subdirectory=subdir_path" # install a python package from a repo subdirectory
+         python -m pip install -e 'git+https://git.repo/some_repo.git#egg=subdir&subdirectory=subdir_path' # install a python package from a repo subdirectory
 
    .. tab:: Windows
 
@@ -378,7 +378,7 @@ Examples
          py -m pip install -e hg+https://hg.repo/some_pkg.git#egg=SomePackage            # from mercurial
          py -m pip install -e svn+svn://svn.repo/some_pkg/trunk/#egg=SomePackage         # from svn
          py -m pip install -e git+https://git.repo/some_pkg.git@feature#egg=SomePackage  # from 'feature' branch
-         py -m pip install -e "git+https://git.repo/some_repo.git#egg=subdir&subdirectory=subdir_path" # install a python package from a repo subdirectory
+         py -m pip install -e 'git+https://git.repo/some_repo.git#egg=subdir&subdirectory=subdir_path' # install a python package from a repo subdirectory
 
 #. Install a package with `extras`_.
 
@@ -425,15 +425,15 @@ Examples
       .. code-block:: shell
 
          python -m pip install SomeProject@http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl
-         python -m pip install "SomeProject @ http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl"
+         python -m pip install 'SomeProject @ http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl'
          python -m pip install SomeProject@http://my.package.repo/1.2.3.tar.gz
 
    .. tab:: Windows
 
       .. code-block:: shell
 
          py -m pip install SomeProject@http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl
-         py -m pip install "SomeProject @ http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl"
+         py -m pip install 'SomeProject @ http://my.package.repo/SomeProject-1.2.3-py33-none-any.whl'
          py -m pip install SomeProject@http://my.package.repo/1.2.3.tar.gz
 
 #. Install from alternative package repositories.