doc: missing 'make' in README + file name misspelled.

README.md

@@ -21,7 +21,7 @@ Documentation is available in directory `doc`. For details on several topics, se
 * `SCRYPT` for how to find the right balance in GPU configuration to mine Scrypt-based coins effectively;
 * `FAQ` for frequently asked questions;
 * `GPU` for semi-obsolete information on GPU configuration options and mining SHA256d-based coins;
-* `windows-build` for information on how to build on Windows.
+* `windows-build.txt` for information on how to build on Windows.
 
 Note that **most of the documentation is outdated**. If you want to contribute, fork this repository, update as needed, and submit a pull request.
 
@@ -66,6 +66,7 @@ Then:
 
     autoreconf -i
     CFLAGS="-O2 -Wall -march=native" ./configure <options>
+    make
 
 Systemwide installation is optional. You may run `sgminer` from the build
 directory directly, or `make install` if you wish to install