Update docs (wbolster#132)

Fixed typos and pip usage

Author: Simewu

Diff for: doc/api.rst

@@ -27,7 +27,7 @@ LevelDB database.
 
       Open the underlying database handle.
 
-      Most arguments have the same name as the the corresponding LevelDB
+      Most arguments have the same name as the corresponding LevelDB
       parameters; see the LevelDB documentation for a detailed description.
       Arguments defaulting to `None` are only propagated to LevelDB if
       specified, e.g. not specifying a `write_buffer_size` means the LevelDB
@@ -85,7 +85,7 @@ LevelDB database.
 
          Closing a database while other threads are busy accessing the same
          database may result in hard crashes, since database operations do not
-         perform any synchronisation/locking on the database object (for
+         perform any synchronization/locking on the database object (for
          performance reasons) and simply assume it is available (and open).
          Applications should make sure not to close databases that are
          concurrently used from other threads.

Diff for: doc/index.rst

@@ -25,7 +25,7 @@ Plyvel's key features are:
 * **High performance**
 
   Plyvel executes all performance-critical code at C speed (using Cython_),
-  which means Plyvel is a good fit for high performance applications.
+  which means Plyvel is a good fit for high-performance applications.
 
   .. _Cython: http://cython.org/
 

Diff for: doc/installation.rst

@@ -78,7 +78,7 @@ If you see an ``ImportError`` complaining about undefined symbols, e.g.
 …then the installer (actually, the linker) was unable to find the LevelDB
 library on your system when building Plyvel. Install LevelDB or set the proper
 environment variables for the compiler and linker and try ``pip install
---reinstall plyvel``.
+--upgrade --force-reinstall plyvel``.
 
 
 .. rubric:: Next steps

Diff for: doc/user.rst

@@ -33,7 +33,7 @@ That's all there is to it. At this point ``/tmp/testdb/`` contains a fresh
 LevelDB database (assuming the directory did not contain a LevelDB database
 already).
 
-For real world applications, you probably want to tweak things like the size of
+For real-world applications, you probably want to tweak things like the size of
 the memory cache and the number of bits to use for the (optional) bloom filter.
 These settings, and many others, can be specified as arguments to the
 :py:class:`DB` constructor. For this tutorial we'll just use the LevelDB