Update basic.md (exercism#23)

Author: ErikSchierboom

docs/basic.md

@@ -3,8 +3,8 @@
 The basic mode of the Snippet Extractor is extremely naive but works well to get you started.
 
 A language config file contains a list of the beginnings of lines that can be ignored.
-The extractor skips over all lines of code that start with a line in the config file.
-Once the extract finds the first non-matching, it returns the next 10 lines, regardless of if they match the config file or not.
+The extractor skips over all lines of code that start with a line that's in the config file.
+Once the extract finds the first non-matching, it returns the next 10 lines, regardless if they match the config file or not.
 
-Things like HEREDOC and block comments where there is not some marker on each line are not supported.
-Use the [Extended Mode](./extended.md) for those.
+Skipping code like HEREDOC and block comments, where there is not some marker on each line, is not supported.
+Use the [Extended Mode](./extended.md) for those cases.