fixed typo

docs/starting/install3/linux.rst

@@ -92,7 +92,7 @@ care about that.
 Pipenv & Virtual Environments
 -----------------------------
 
-The next step it to install Pipenv, so you can install dependencies and manage virtual environments. 
+The next step is to install Pipenv, so you can install dependencies and manage virtual environments. 
 
 A Virtual Environment is a tool to keep the dependencies required by different projects
 in separate places, by creating virtual Python environments for them. It solves the

docs/starting/install3/osx.rst

@@ -106,7 +106,7 @@ If the Homebrew version of Python 3 is installed then ``pip3`` will point to Pyt
 Pipenv & Virtual Environments
 -----------------------------
 
-The next step it to install Pipenv, so you can install dependencies and manage virtual environments. 
+The next step is to install Pipenv, so you can install dependencies and manage virtual environments. 
 
 A Virtual Environment is a tool to keep the dependencies required by different projects
 in separate places, by creating virtual Python environments for them. It solves the

docs/starting/install3/win.rst

@@ -87,7 +87,7 @@ To install pip, run the Python script available here:
 Pipenv & Virtual Environments
 -----------------------------
 
-The next step it to install Pipenv, so you can install dependencies and manage virtual environments.
+The next step is to install Pipenv, so you can install dependencies and manage virtual environments.
 
 A Virtual Environment is a tool to keep the dependencies required by different projects
 in separate places, by creating virtual Python environments for them. It solves the