Making README consistent with other plugins' READMEs (#3248)

plugin/import/README.md

@@ -2,11 +2,11 @@
 
 ## Name
 
-*import* - include files or reference snippets from a Corefile.
+*import* - includes files or references snippets from a Corefile.
 
 ## Description
 
-The *import* plugin can be used to include files into the main configuration. Another use it to
+The *import* plugin can be used to include files into the main configuration. Another use is to
 reference predefined snippets. Both can help to avoid some duplication.
 
 This is a unique directive in that *import* can appear outside of a server block. In other words, it