Remove unneeded duplicate words

src/dtoa.c

@@ -167,7 +167,7 @@
  *	FREE_DTOA_LOCK(...) are avoided; instead each thread with thread
  *	number < n has a separate copy of relevant data structures.
  *	After set_max_dtoa_threads(n), a call set_max_dtoa_threads(m)
- *	with m <= n has has no effect, but a call with m > n is honored.
+ *	with m <= n has no effect, but a call with m > n is honored.
  *	Such a call invokes REALLOC (assumed to be "realloc" if REALLOC
  *	is not #defined) to extend the size of the relevant array.
 

test/natalie/complex_test.rb

@@ -22,7 +22,7 @@
     r.imaginary.should == 3
   end
 
-  it 'does not have have Comparable mixin more than once' do
+  it 'does not have Comparable mixin more than once' do
     Complex.ancestors.count(Comparable).should == 1
   end
 end