Update README.txt to fix some minor things

README.txt

@@ -15,7 +15,7 @@ NOTE: all of these except doc/ are just links to web.archive.org, not actual up-
 This game is not finished:
 --------------------------
 - Don't expect it to work as well as a finished game will.
-- Please report any bugs to us. debug.txt is useful.
+- Please report any bugs to me. debug.txt is useful.
 
 Controls:
 ---------
@@ -57,7 +57,7 @@ Compiling on GNU/Linux:
 Install dependencies. Here's an example for Debian/Ubuntu:
 $ sudo apt install build-essential libirrlicht-dev cmake libbz2-dev libpng-dev libjpeg8-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev
 
-Download source, extract (this is the URL to the latest of source repository, which might not work at all times):
+Download source, extract (with git):
 $ git clone https://git.minetest.land/oerkki/minetest.git
 $ cd minetest
 or (without git):
@@ -67,7 +67,7 @@ $ cd minetest
 
 Build a version that runs directly from the source directory:
 $ cmake . -DRUN_IN_PLACE=1
-$ make -j($nproc)
+$ make -j$(nproc)
 
 Run it:
 $ ./bin/minetest
@@ -80,7 +80,8 @@ $ ./bin/minetest
 
 Compiling on Windows:
 ---------------------
-NOTE: untested and borrowed from celeron55/minetest. Should be updated eventually
+NOTE: untested, taken from old celeron55/minetest README.
+Should be updated eventually
 
 - You need:
 	* CMake:
@@ -278,5 +279,3 @@ THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 IN THE SOFTWARE.
-
-