keys: Rename the help category of message compose box actions.

The category name in the code: 'msg_compose' -> 'compose_box'
The user visible name: 'Composing a message' -> 'Writing a message'

This is to emphasize its difference from the other newly created
category for actions that open the compose box, to both users and
developers.

Hotkeys document regenerated.

Author: Niloth-p

docs/hotkeys.md

@@ -82,7 +82,7 @@
 |New message to a stream|<kbd>c</kbd>|
 |New message to a person or group of people|<kbd>x</kbd>|
 
-## Composing a Message
+## Writing a message
 |Command|Key Combination|
 | :--- | :---: |
 |Cycle through recipient and content boxes|<kbd>Tab</kbd>|

zulipterminal/config/keys.py

@@ -139,28 +139,28 @@ class KeyBinding(TypedDict):
     'CYCLE_COMPOSE_FOCUS': {
         'keys': ['tab'],
         'help_text': 'Cycle through recipient and content boxes',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'SEND_MESSAGE': {
         'keys': ['ctrl d', 'meta enter'],
         'help_text': 'Send a message',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'SAVE_AS_DRAFT': {
         'keys': ['meta s'],
         'help_text': 'Save current message as a draft',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'AUTOCOMPLETE': {
         'keys': ['ctrl f'],
         'help_text': ('Autocomplete @mentions, #stream_names, :emoji:'
                       ' and topics'),
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'AUTOCOMPLETE_REVERSE': {
         'keys': ['ctrl r'],
         'help_text': 'Cycle through autocomplete suggestions in reverse',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'ADD_REACTION': {
         'keys': [':'],
@@ -180,12 +180,12 @@ class KeyBinding(TypedDict):
     'NARROW_MESSAGE_RECIPIENT': {
         'keys': ['meta .'],
         'help_text': 'Narrow to compose box message recipient',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'EXIT_COMPOSE': {
         'keys': ['esc'],
         'help_text': 'Exit message compose box',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'TOGGLE_NARROW': {
         'keys': ['z'],
@@ -426,7 +426,7 @@ class KeyBinding(TypedDict):
         # and to differentiate from other hotkeys using 'enter'.
         'keys': ['enter'],
         'help_text': 'Insert new line',
-        'key_category': 'msg_compose',
+        'key_category': 'compose_box',
     },
     'FULL_RENDERED_MESSAGE': {
         'keys': ['f'],
@@ -453,7 +453,7 @@ class KeyBinding(TypedDict):
     "msg_actions": "Message actions",
     "stream_list": "Stream list actions",
     "open_compose": "Begin composing a message",
-    "msg_compose": "Composing a Message",
+    "compose_box": "Writing a message",
     "editor_navigation": "Editor: Navigation",
     "editor_text_manipulation": "Editor: Text Manipulation",
 }