docs(userspace/libsinsp/filter/parser): fix grammar doc

The spaces after the operator tokens were intended to indicate operators that mandate a whitespace character to be followed.

Co-authored-by: Jason Dellaluce <[email protected]>
Signed-off-by: Leonardo Grasso <[email protected]>

Author: 2 people

userspace/libsinsp/filter/parser.h

@@ -64,13 +64,14 @@ class RE2;
 //     UnaryOperator       ::= 'exists'
 //     NumOperator         ::= '<=' | '<' | '>=' | '>'
 //     StrOperator         ::= '==' | '=' | '!='
-//                             | 'bcontains' | 'bstartswith'
-//                             | 'contains'
-//                             | 'endswith'
-//                             | 'glob'
-//                             | 'icontains'
-//                             | 'startswith'
-//                             | 'regex'
+//                             | 'bcontains ' | 'bstartswith '
+//                             | 'contains '
+//                             | 'endswith '
+//                             | 'glob '
+//                             | 'icontains '
+//                             | 'iglob '
+//                             | 'startswith '
+//                             | 'regex '
 //     ListOperator        ::= 'in' | 'intersects' | 'pmatch'
 //     FieldTransformerVal    ::= 'val('
 //     FieldTransformerType   ::= 'tolower(' | 'toupper(' | 'b64(' | 'basename(' | 'len('