Fix code blocks in the documentation
"shell" is an unknown lexer for Jekyll, "bash" should be used instead.
@@ -279,7 +279,7 @@ example that validates that the output of `myrule` from above is `"abc"`.
`//mypkg/myrule_validator.sh`:
-```shell
+```bash
if [ "$(cat $1)" = "abc" ]; then
echo "Passed"
exit 0
@@ -320,7 +320,7 @@ substitutions) instead of numeric ones (for arguments).
`//mypkg/myrule_validator.sh.template`:
-```shell
+```bash
if [ "$(cat %TARGET%)" = "abc" ]; then
echo "Passed"
exit 0
