[docs] Fix typo.

Based on a patch by Stanislav Manilov!

llvm-svn: 233771

docs/tutorial/LangImpl5.rst

@@ -388,7 +388,7 @@ code:
 
 The first two lines here are now familiar: the first adds the "merge"
 block to the Function object (it was previously floating, like the else
-block above). The second block changes the insertion point so that newly
+block above). The second changes the insertion point so that newly
 created code will go into the "merge" block. Once that is done, we need
 to create the PHI node and set up the block/value pairs for the PHI.
 

docs/tutorial/OCamlLangImpl5.rst

@@ -336,7 +336,7 @@ for the 'then' block.
           let phi = build_phi incoming "iftmp" builder in
 
 The first two lines here are now familiar: the first adds the "merge"
-block to the Function object. The second block changes the insertion
+block to the Function object. The second changes the insertion
 point so that newly created code will go into the "merge" block. Once
 that is done, we need to create the PHI node and set up the block/value
 pairs for the PHI.