all: format code according to Go 1.19 rules

Go 1.19 started reformatting code in a way that makes it more obvious
how it will be rendered on pkg.go.dev. It gets it almost right, but not
entirely. Therefore, I had to modify some of the comments so that they
are formatted correctly.

src/syscall/errno.go

@@ -13,10 +13,11 @@ import "internal/itoa"
 // An Errno is an unsigned number describing an error condition.
 // It implements the error interface. The zero Errno is by convention
 // a non-error, so code to convert from Errno to error should use:
-//      err = nil
-//      if errno != 0 {
-//              err = errno
-//      }
+//
+//	err = nil
+//	if errno != 0 {
+//	        err = errno
+//	}
 type Errno uintptr
 
 func (e Errno) Error() string {