Fix some typos in ocaml-perf-notes.mkd

ocaml-perf-notes.md

@@ -13,8 +13,8 @@ The notes fall into the following categories:
  * notes on reading OCaml assembly code so that you may understand
     what your own OCaml programs do on the CPU.
 
-When possible have tried to motivate these with snippets of assembly
-code generated by ocamlopt.
+When possible we have tried to motivate these with snippets of
+assembly code generated by ocamlopt.
 
 As a caveat, performance optimizations are sometimes at odds with
 desirable programming styles such as preserving abstraction boundaries
@@ -47,7 +47,7 @@ OCAMLOPTFLAGS += -S
 to your local `OMakefile`.
 
 It is best to generate assembly code with full inlining and other
-optimizations that the compiler supports.  Even thought inlining and
+optimizations that the compiler supports.  Even though inlining and
 optimization might make the code a bit harder to read, it will give
 you a more accurate picture of what executes on the CPU.  Profiling
 tool like `gprof` where the inlining and such only serves to confuse