Fix minor typos in README.md and spec.bs (#137)

Author: dmcardle

README.md

@@ -245,7 +245,7 @@ aggregating machine learning update vectors or extending the histogram operation
 to support values that are vectors of integers rather than only scalars.
 
 The operation would be indicated by using the appropriate JavaScript call, e.g.
-`contributeToHistogram()` and `contributToDistinctCount()` for histograms and
+`contributeToHistogram()` and `contributeToDistinctCount()` for histograms and
 count distinct, respectively.
 
 ## Reports

spec.bs

@@ -77,7 +77,7 @@ functionality to be available.
 Overview {#overview}
 --------------------
 
-This document oulines a general-purpose API that can be called from isolated
+This document outlines a general-purpose API that can be called from isolated
 contexts that have access to cross-site data (such as a Shared Storage worklet).
 Within these contexts, potentially identifying data can be encapsulated into
 "aggregatable reports". To prevent leakage, the cross-site data in these reports