Trivial doc change: fix typo in tutorial

[Stanislav Manilov]

The text of Chapter 3 of the LLVM Kaleidoscope tutorial erroneously says
"block" instead of "line" and is fixed by this patch.
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Index: docs/tutorial/LangImpl5.rst
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--- docs/tutorial/LangImpl5.rst	(revision 233715)
+++ docs/tutorial/LangImpl5.rst	(working copy)
@@ -388,7 +388,7 @@
 
 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 line 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.