Fix --enable-shared sample command

plugins/python-build/README.md

@@ -152,13 +152,13 @@ $ cat fix1.patch fix2.patch | pyenv install --patch 2.7.10
 You can build CPython with `--enable-shared` to install a version with
 shared object.
 
-If `--enabled-shared` was found in `PYTHON_CONFIGURE_OPTS` or `CONFIGURE_OPTS`,
+If `--enable-shared` was found in `PYTHON_CONFIGURE_OPTS` or `CONFIGURE_OPTS`,
 `python-build` will automatically set `RPATH` to the pyenv's prefix directory.
 This means you don't have to set `LD_LIBRARY_PATH` or `DYLD_LIBRARY_PATH` for
 the version(s) installed with `--enable-shared`.
 
 ```sh
-$ env PYTHON_CONFIGURE_OPTS="--enable-shared` pyenv install 2.7.9
+$ env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 2.7.9
 ```
 
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