docs/Passes: fix some typos

Patch by Yacine Belkadi.

llvm-svn: 182197
diff --git a/llvm/docs/Passes.rst b/llvm/docs/Passes.rst
index d279eca..d30c3ca 100644
--- a/llvm/docs/Passes.rst
+++ b/llvm/docs/Passes.rst
@@ -490,7 +490,7 @@
 ``-constprop``: Simple constant propagation
 -------------------------------------------
 
-This file implements constant propagation and merging.  It looks for
+This pass implements constant propagation and merging.  It looks for
 instructions involving only constant operands and replaces them with a constant
 value instead of an instruction.  For example:
 
@@ -505,8 +505,8 @@
   i32 3
 
 NOTE: this pass has a habit of making definitions be dead.  It is a good idea
-to to run a :ref:`Dead Instruction Elimination <passes-die>` pass sometime
-after running this pass.
+to run a :ref:`Dead Instruction Elimination <passes-die>` pass sometime after
+running this pass.
 
 .. _passes-dce:
 
@@ -1037,7 +1037,7 @@
 * Proves conditional branches to be unconditional
 
 Note that this pass has a habit of making definitions be dead.  It is a good
-idea to to run a :ref:`DCE <passes-dce>` pass sometime after running this pass.
+idea to run a :ref:`DCE <passes-dce>` pass sometime after running this pass.
 
 ``-simplify-libcalls``: Simplify well-known library calls
 ---------------------------------------------------------