fix(docs): correct description of into_cql2_text (#1036)

### Description

Tiny docs patch -- into_cql2_json and into_cql2_text have the same
docstring

### Checklist

Delete any checklist items that do not apply (e.g. if your change is
minor, it may not require documentation updates).

- [x] Documentation, including doctests
- [x] Pull request title follows [conventional
commits](https://www.conventionalcommits.org/en/v1.0.0/)

Author: mikemahoney218

crates/core/src/api/filter.rs

@@ -32,7 +32,7 @@ impl Filter {
         }
     }
 
-    /// Converts this filter to cql2-json.
+    /// Converts this filter to cql2-text.
     pub fn into_cql2_text(self) -> Result<Filter> {
         match self {
             Filter::Cql2Text(_) => Ok(self),