doc/README.md: clarify steps building docs [ci skip]

lpranam · Nov 4, 2019 · cb5b2e0 · cb5b2e0
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diff --git a/doc/README.md b/doc/README.md
@@ -4,30 +4,31 @@ A simple guide about writing and building documentation for Boost.GIL.
 
 ## Prerequisites
 
-- Python 3.6+
-- [Install Sphinx](#install-sphinx) 1.7.9+
+- Python 3
+- [Install Sphinx](#install-sphinx) (see `requirements.txt`)
 - Install [Doxygen](http://www.doxygen.org)
 
+
 ## Installation
 
 Create Python virtual environment:
 
 ```console
-$ cd boost/libs/gil
 $ python3 -m venv .venv
-$ source ./.venv/bin/activate
+$ source ~/.venv/bin/activate
 ```
 
 Install Sphinx and Sphinx extensions:
 
 ```console
-(.venv)$ pip install -r doc/requirements.txt
+(.venv)$ cd boost-root
+(.venv)$ pip install -r libs/gil/doc/requirements.txt
 ```
 
 ## Build
 
 ```console
 $ echo "using doxygen ;" > ~/user-config.jam
-$ cd boost/libs/gil/doc
-$ b2
+$ cd boost-root
+$ b2 libs/gil/doc
 ```