fix readme typos

Author: wholmgren

pvlib/spa_c_files/README.md

@@ -1,17 +1,17 @@
 README
 ------
 
-NREL provides a fast C implementation of the solar position algorithm 
+NREL provides a C implementation of the solar position algorithm 
 described in 
-(Reda, I.; Andreas, A. (2003). Solar Position Algorithm for Solar Radiation Applications. 55 pp.; NREL Report No. TP-560-34302)
-[http://www.nrel.gov/docs/fy08osti/34302.pdf].
+[Reda, I.; Andreas, A. (2003). Solar Position Algorithm for Solar Radiation Applications. 55 pp.; NREL Report No. TP-560-34302](
+http://www.nrel.gov/docs/fy08osti/34302.pdf).
 
 This folder contains the files required to make NREL's C code accessible
-to the pvlib-python package. We use the Cython package to wrap the NREL SPA 
-algorithm. 
+to the ``pvlib-python`` package. We use the Cython package to wrap NREL's SPA 
+implementation. 
 
-** Due to license issues, you must download the NREL C files from their 
-(website)[http://www.nrel.gov/midc/spa/#register] **
+** Due to licensing issues, you must download the NREL C files from their 
+[website](http://www.nrel.gov/midc/spa) **
 
 Download the ``spa.c`` and ``spa.h`` files from NREL, 
 and copy them into the ``pvlib/spa_c_files`` directory. 
@@ -20,7 +20,7 @@ There are a total of 5 files needed to compile the C code, described below:
 
 * ``spa.c``: original C code from NREL 
 * ``spa.h``: header file for spa.c
-* ``cspa_py.pxd``: a cython header file- essentially tells cython which parts of the main header file to pay attention to
+* ``cspa_py.pxd``: a cython header file which essentially tells cython which parts of the main header file to pay attention to
 * ``spa_py.pyx``: the cython code used to define both functions in the python namespace. NOTE: It is possible to provide user access to other paramters of the SPA algorithm through modifying this file 
 * ``setup.py``: a distutils file which performs the compiling of the cython code
 
@@ -32,4 +32,3 @@ To process the original 5 files,
 use the following shell command inside this folder
 
  $ python setup.py build_ext --inplace
-