README.md: Minor corrections

README.rst

@@ -25,7 +25,7 @@ BuildStream offers the following advantages:
 
 * **Declarative build instructions/definitions**
 
-  BuildStream provides a a flexible and extensible framework for the modelling
+  BuildStream provides a flexible and extensible framework for the modelling
   of software build pipelines in a declarative YAML format, which allows you to
   manipulate filesystem data in a controlled, reproducible sandboxed environment.
 
@@ -61,13 +61,14 @@ How does BuildStream work?
 ==========================
 BuildStream operates on a set of YAML files (.bst files), as follows:
 
-* loads the YAML files which describe the target(s) and all dependencies
-* evaluates the version information and build instructions to calculate a build
+* Loads the YAML files which describe the target(s) and all dependencies.
+* Evaluates the version information and build instructions to calculate a build
   graph for the target(s) and all dependencies and unique cache-keys for each
-  element
-* retrieves elements from cache if they are already built, or builds them in a
-  sandboxed environment using the instructions declared in the .bst files
-* transforms/configures and/or deploys the resulting target(s) based on the
+  element.
+* Retrieves previously built elements (artifacts) from a local/remote cache, or
+  builds the elements in a sandboxed environment using the instructions declared
+  in the .bst files.
+* Transforms/configures and/or deploys the resulting target(s) based on the
   instructions declared in the .bst files.