articles/pascal.md: update

articles/pascal.md

@@ -9,7 +9,7 @@ In its "vanilla" form, Pascal is not any more complex than C, aside from having
 such as range types, nested procedures, sets, builtin tagged unions, etc.
 
 Pascal has an ISO standard: ISO 7185. Since the Pascal described in said standard is quite useless for practical programming,
-most compilers are for an extended superset of Pascal.
+most compilers are for an extended superset of the Pascal described in that standard.
 
 ## Compilers
 - [FPC](https://www.freepascal.org/) (Free Pascal Compiler): currently the most popular Pascal compiler with wide support
@@ -61,14 +61,10 @@ fpc hellopascal.pas
 
 ### Factorial
 ```pascal
-{
-    Calculate a factorial on multiple languages: Pascal version
-    Compile with: fpc -O3 -S2 fact.pas
-}
-program Factorials;
+program Factorial;
 
 { qword = 64 bit unsigned type }
-function Factorial(n: qword): qword;
+function factorial(n: qword): qword;
 begin
     Result := 1;
     while n > 0 do
@@ -76,7 +72,7 @@ begin
         { The usage of C-like arithmetic assignment operators is possible with -Sc: }
         { Result *= n; }
         Result := Result * n;
-        Dec(n); { equivalent to C's `--` operator }
+        dec(n); { equivalent to C's `--` operator }
     end;
 end;
 
@@ -86,11 +82,16 @@ var
 begin
     for n in values do
     begin
-        WriteLn('Factorial of ', n, ' = ',  Factorial(n));
+        writeLn('Factorial of ', n, ' = ',  factorial(n));
     end;
 end.
 ```
 
+Compiling:
+```
+fpc -O3 -S2 fact.pas
+```
+
 ## Resources
 - [Free Pascal Wiki](https://wiki.freepascal.org/Main_Page)
 - [Basic Pascal Tutorial](https://wiki.freepascal.org/Basic_Pascal_Tutorial)