Fix the shell script indentation -- should be 4, not 2

Fix the value for shell indentation, which was incorrectly set to 2.

Also, streamline the comments at the top so that they are less verbose
and visually assaulting.

Author: mhucka

.editorconfig

@@ -12,14 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-# Common editor configurations for this project.
-#
-# EditorConfig is a file format for specifying some common style parameters.
+# Summary: define basic code editor style parameters for this project.
+
 # Many IDEs & editors read .editorconfig files, either natively or via plugins.
 # We mostly follow Google's style guides (https://google.github.io/styleguide/)
 # with only a few deviations for line length and indentation in some files.
-# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 root = true
 
@@ -51,7 +48,7 @@ indent_size = 2
 indent_size = 4
 
 [*.sh]
-indent_size = 2
+indent_size = 4
 
 [{*.yaml,*.yml}]
 indent_size = 2