Fixed indent from tabs to spaces

Author: Jonas Tepe

src/doc/nomicon/vec-final.md

@@ -227,10 +227,10 @@ impl<T> Iterator for RawValIter<T> {
             unsafe {
                 let result = ptr::read(self.start);
                 self.start = if mem::size_of::<T>() == 0 {
-					(self.start as usize + 1) as *const _
-				} else {
-					self.start.offset(1)
-				};
+                    (self.start as usize + 1) as *const _
+                } else {
+                    self.start.offset(1)
+                };
                 Some(result)
             }
         }
@@ -251,10 +251,10 @@ impl<T> DoubleEndedIterator for RawValIter<T> {
         } else {
             unsafe {
                 self.end = if mem::size_of::<T>() == 0 {
-					(self.end as usize - 1) as *const _
-				} else {
-					self.end.offset(-1)
-				};
+                    (self.end as usize - 1) as *const _
+                } else {
+                    self.end.offset(-1)
+                };
                 Some(ptr::read(self.end))
             }
         }