Fix typo

docs/grammar.md

@@ -43,7 +43,7 @@ Literals can be one of:
 * `/regular expression+/`
 * `"case-insensitive string"i`
 * `/re with flags/imulx`
-* Literal range: `"a".."z"`, `"1..9"`, etc.
+* Literal range: `"a".."z"`, `"1".."9"`, etc.
 
 #### Notes for when using a lexer:
 
@@ -145,4 +145,4 @@ If the module path is relative, such as `.path.to.file`, Lark will attempt to lo
 
 ### %declare
 
-Declare a terminal without defining it. Useful for plugins.
+Declare a terminal without defining it. Useful for plugins.