message: fix a few spelling errors
diff: @@ -25,7 +25,7 @@ Python is one of the most powerfull language on the earth. It's easy to use and
  <a name="buildingpyeos"></a>
  # Building Pyeos
  -You have to export two environment before build,one telling the compiler where to find the Python header file,the other telling the linker where to find the Python library.
  +You have to export two environment before building pyeos, one telling the compiler where to find the Python header file, the other telling the linker where to find the Python library.
  ```bash
  export PYTHON_INC_DIR="~/anaconda/include/python3.6m"
  @@ -52,7 +52,7 @@ or
  pip install cython
  ```
  -Now following the instruction on [Building EOS and running a node](https://github.com/learnforpractice/pyeos#runanode)
  +Now follow the instruction on [Building EOS and running a node](https://github.com/learnforpractice/pyeos#runanode)
  Currently only test with Python 3.6 on macOS 10.12.6
  @@ -62,7 +62,7 @@ Currently only test with Python 3.6 on macOS 10.12.6
  Bad code style will affect the cooperation between developers. So there must be some rule for developers to follow. Here is my recommendation: [google cpp guide](https://google.github.io/styleguide/cppguide.html) Who use eclipse as their IDE can use the following tool to format there cpp code.
  http://www.cppstyle.com/
  -Also in order to compatible with eos source code, Change the tab with to 3 spaces.
  +Also in order to compatible with eos source code, Change the tab width to 3 spaces.
  <a name="runningpyeos"></a>
  # Running Pyeos
  