Ban the word 'example' from non-code text

The README can turn awkward after running the rename script.

README.rst

@@ -58,7 +58,7 @@ Usage::
 
 If you have installed Varnish to a non-standard directory, call
 ``autogen.sh`` and ``configure`` with ``PKG_CONFIG_PATH`` pointing to
-the appropriate path. For example, when varnishd configure was called
+the appropriate path. For instance, when varnishd configure was called
 with ``--prefix=$PREFIX``, use
 
  PKG_CONFIG_PATH=${PREFIX}/lib/pkgconfig
@@ -106,4 +106,5 @@ COMMON PROBLEMS
 * Incompatibilities with different Varnish Cache versions
 
   Make sure you build this vmod against its correspondent Varnish Cache version.
-  For example, to build against Varnish Cache 4.0, this vmod must be built from branch 4.0.
+  For instance, to build against Varnish Cache 4.0, this vmod must be built from
+  branch 4.0.