misc: fix spelling

mrbgems/mruby-bigint/README-fgmp.md

@@ -50,7 +50,7 @@ I hereby place this file and all of FGMP in the public domain.
 
 Thanks to Paul Rouse <par@r-cube.demon.co.uk> for changes to get fgmp
 to work on a 286 MS-DOS compiler, the functions mpz_sqrt and
-mpz_sqrtrem, plus other general bug fixes.
+mpz_sqrtrem, plus other general bugfixes.
 
 Thanks also to Erick Gallesio <eg@kaolin.unice.fr> for a fix
 to mpz_init_set_str

mrbgems/mruby-bigint/core/bigint.h

@@ -19,7 +19,7 @@
  * I'm already aware that fgmp is considerably slower than gmp
  *
  * CREDITS:
- *  Paul Rouse <par@r-cube.demon.co.uk> - generic bug fixes, mpz_sqrt and
+ *  Paul Rouse <par@r-cube.demon.co.uk> - generic bugfixes, mpz_sqrt and
  *    mpz_sqrtrem, and modifications to get fgmp to compile on a system
  *    with int and long of different sizes (specifically MS-DOS,286 compiler)
  *  Also see the file "notes" included with the fgmp distribution, for

mrbgems/mruby-bin-mruby/tools/mruby/mruby.c

@@ -342,7 +342,7 @@ main(int argc, char **argv)
       mrb_ccontext_cleanup_local_variables(mrb, c);
     }
 
-    /* set program file name */
+    /* set program filename */
     mrb_ccontext_filename(mrb, c, cmdline);
 
     /* Load program */