Format/typo check 1989/robison

In the README.md I added an INABIAF section as well. I updated bugs.md
as well (updating the wording as it was already in bugs.md).

1989/robison/README.md

@@ -38,7 +38,10 @@ echo -100 x 100 + 1 | ./robison
 echo 100 / 100 | ./robison # <-- what happens here ?
 ```
 
-NOTE: this entry will crash with numbers with non binary digits.
+### INABIAF - it's not a bug it's a feature! :-)
+
+This program will very likely crash or break into tiny bits :-) if you feed it
+numbers with non-binary digits.
 
 ## Judges' remarks:
 
@@ -48,14 +51,15 @@ the source deck can be re-collated with an ASCII sort.
 Note that this program uses only a small subset of the
 constructs that the C language supports.
 
-NOTE: this entry will likely dump core with invalid input.
-
+For an interesting document on APL, see
+<https://computerhistory.org/blog/the-apl-programming-language-source-code/>.
 
 ## Author's remarks:
 
-This program is a handy picoAPL interpreter written in C--.  It
-outputs the evaluation of an APL expression from standard
-input.  Functions are limited to dyadic +,-,x, and unary -;
+This program is a handy picoAPL interpreter written in `C--`.  It
+outputs the evaluation of an
+[APL](https://en.wikipedia.org/wiki/APL_(programming_language)) expression from standard
+input.  Functions are limited to dyadic `+`,`-`,`x`, and unary `-`;
 numerals must be binary.  Parentheses may be used for
 grouping.  For example:
 
@@ -72,17 +76,17 @@ prints:
 That is `5x(7-4)` is `15`.  (APL groups from right to left.)
 Extending it to the full APL language should be trivial.
 
-The C-- language improves the C language by removing superfluous
+The `C--` language improves the C language by removing superfluous
 and confusing features: arithmetic, logical operations, shifts,
-relationals, address-of, and flow control.  In fact, the only
+relational operators, address-of, and flow control.  In fact, the only
 expressions retained are function calls, indirection, array
-assignments, the ',' operator, and sizeof.  Despite these
-restrictions, the C-- program does arithmetic on arbitrarily
+assignments, the ',' operator, and `sizeof`.  Despite these
+restrictions, the `C--` program does arithmetic on arbitrarily
 large binary numbers.
 
-To obtain a C-- reference, simply rip out the irrelevant pages
-from your K&R C manual.  To obtain a C-- compiler, simply rip
-out the irrelevant bytes from your cc compiler.
+To obtain a `C--` reference, simply rip out the irrelevant pages
+from your K&R C manual.  To obtain a `C--` compiler, simply rip
+out the irrelevant bytes from your `cc` compiler.
 
 ## Copyright and CC BY-SA 4.0 License: