docs: new filter command

docs/configuration/keymap.md

@@ -11,12 +11,13 @@ If you haven't created and used your own configuration file yet, please see [Con
 
 ## manager
 
-- escape: Cancel find, exit visual mode, clear selected, or cancel search.
+- escape: Cancel find, exit visual mode, clear selected, cancel filter, or cancel search.
 
   - `--all`: Do all of the above.
   - `--find`: Cancel find.
   - `--visual`: Exit visual mode.
   - `--select`: Clear selected.
+  - `--filter`: Cancel filter.
   - `--search`: Cancel search.
 
   Automatically determine the operation by default, and it will only execute the selected operation after specifying the option; multiple options can be stacked.
@@ -142,7 +143,7 @@ If you haven't created and used your own configuration file yet, please see [Con
 
 - find
 
-  - `query`: Optional, the query to find for. If not provided, a interactive UI will be used to input with.
+  - `query`: Optional, the query to find for. If not provided, an interactive UI will be used to input with.
   - `--previous`: Find for the previous occurrence.
   - `--smart`: Use smart-case when finding, i.e. case-sensitive if the query contains uppercase characters, otherwise case-insensitive.
   - `--insensitive`: Use case-insensitive find.
@@ -151,6 +152,12 @@ If you haven't created and used your own configuration file yet, please see [Con
 
   - `--previous`: Move to the previous occurrence.
 
+- filter
+
+  - `query`: Optional, the query to filter for. If not provided, an interactive UI will be used to input with.
+  - `--smart`: Use smart-case when filtering, i.e. case-sensitive if the query contains uppercase characters, otherwise case-insensitive.
+  - `--insensitive`: Use case-insensitive filter.
+
 - sort
 
   - `by`: Optional, if not provided, the sort method will be kept unchanged.