Fix spelling errors: neighoring => neighboring.

Change-Id: Ia43084c78bd879874c3c4e7a455eec7a2feef6ff
diff --git a/src/dsp/arm/film_grain_neon.cc b/src/dsp/arm/film_grain_neon.cc
index c76dfc7..77121e0 100644
--- a/src/dsp/arm/film_grain_neon.cc
+++ b/src/dsp/arm/film_grain_neon.cc
@@ -171,7 +171,7 @@
         // various values of params.auto_regression_coeff_lag. The letter 'O'
         // represents the current sample. (The filter always operates on the
         // current sample with filter coefficient 1.) The letters 'X'
-        // represent the neighoring samples that the filter operates on, below
+        // represent the neighboring samples that the filter operates on, below
         // their corresponding "offset" number.
         //
         // params.auto_regression_coeff_lag == 3:
diff --git a/src/dsp/film_grain.cc b/src/dsp/film_grain.cc
index 4651f85..e215144 100644
--- a/src/dsp/film_grain.cc
+++ b/src/dsp/film_grain.cc
@@ -404,7 +404,7 @@
   // A pictorial representation of the auto-regressive filter for various values
   // of params.auto_regression_coeff_lag. The letter 'O' represents the current
   // sample. (The filter always operates on the current sample with filter
-  // coefficient 1.) The letters 'X' represent the neighoring samples that the
+  // coefficient 1.) The letters 'X' represent the neighboring samples that the
   // filter operates on.
   //
   // params.auto_regression_coeff_lag == 3: