Support proper %g, %f, and %a float formatting

See #61
See #104

libc/fmt/vsprintf.c

@@ -22,7 +22,7 @@
 /**
  * Formats string to buffer hopefully large enough w/ vararg state.
  *
- * @see palandprintf() and printf() for detailed documentation
+ * @see __fmt() and printf() for detailed documentation
  * @see vsnprintf() for modern alternative w/ buf size param
  */
 int(vsprintf)(char *buf, const char *fmt, va_list va) {