Add alt code to 2005/persano + format/typo checks

The alt code should (though untested) work in Windows which
distinguishes between text and binary. It uses the Windows functions
_fileno() and _setmode() to set binary mode on stdout.

The README.md file has been format/typo checked.

2005/persano/README.md

@@ -4,6 +4,9 @@
 make
 ```
 
+There is an alternate version of this entry which should work for Windows by
+setting binary mode on `stdout`. See [alternate code](#alternate-code) below.
+
 
 ## To use:
 
@@ -25,6 +28,34 @@ manipulate animated GIFs - to slow down the animation and to compress the GIFs
 generated by the entry).
 
 
+## Alternate code:
+
+This (untested as we have no Windows system) version uses the Windows API
+functions `_setmode()` and `_fileno(3)` to set binary mode on `stdout` which should
+let it work with Windows.
+
+
+### Alternate build:
+
+```
+make alt
+```
+
+### Alternate use:
+
+Use `persano.alt` as you would `persano` above.
+
+
+### Alternate try:
+
+```sh
+./persano.alt 3 16 > knot3-16.gif
+```
+
+Follow the same instructions, using different tools if necessary, as the above
+try section.
+
+
 ## Judges' remarks:
 
 If your system is one of those that distinguish between text and binary
@@ -52,9 +83,10 @@ knots](https://en.wikipedia.org/wiki/Torus_knot) to standard output.
 ./persano p q [num frames]
 ```
 
+
 ### DESCRIPTION
 
-A (p,q)-[torus knot](https://en.wikipedia.org/wiki/Torus_knot) is a closed,
+A `(p,q)`-[torus knot](https://en.wikipedia.org/wiki/Torus_knot) is a closed,
 non-intersecting curve on the surface of a
 [torus](https://en.wikipedia.org/wiki/Torus) in R3 that winds `p` times around
 one cycle of the torus and `q` times around the other. `p` and `q` should be
@@ -83,6 +115,7 @@ output; since the number of frames is not specified, an animation with
 
 Please view the code with 8-character tabs!
 
+
 ### OUTPUT FORMAT
 
 The program writes fully valid GIF 89 streams.
@@ -98,6 +131,7 @@ to GIF overhead.
 The GIF format supports only a limited number of bits per pixel, so the
 program uses ordered dithering to emulate full RGB output.
 
+
 ### PORTABILITY
 
 The program was tested on Linux, with gcc 3.1; Cygwin, with gcc 3.3; and
@@ -109,6 +143,7 @@ It should also be mentioned that the program won't work on systems that
 distinguish between text and binary streams; however, since hardly
 anyone uses such systems in this day and age, this is a minor issue. [4]
 
+
 ### EXERCISES FOR THE READER
 
 1. (1 point) The surface is composed of many small polygons. Try to make it
@@ -119,6 +154,7 @@ smoother by increasing the number of polygons.
 3. (5 points) Locate the famous transcendental constant
 [π](https://en.wikipedia.org/wiki/Pi) in the code.
 
+
 ### FOOTNOTES
 
 [1] You can call such a transformation an "ambient isotopy" if you want to