chore: fix description typo

Author: xmatthias

build_helpers/schema.json

@@ -1462,7 +1462,7 @@
           "default": false
         },
         "override_exchange_check": {
-          "description": "Override the exchange check to force FreqAI to use exchangesthat may not have enough historic data. Turn this to True if you know your FreqAI model and strategy do not require historical data.",
+          "description": "Override the exchange check to force FreqAI to use exchanges that may not have enough historic data. Turn this to True if you know your FreqAI model and strategy do not require historical data.",
           "type": "boolean",
           "default": false
         },

freqtrade/config_schema/config_schema.py

@@ -1144,7 +1144,7 @@
                 },
                 "override_exchange_check": {
                     "description": (
-                        "Override the exchange check to force FreqAI to use exchanges"
+                        "Override the exchange check to force FreqAI to use exchanges "
                         "that may not have enough historic data. Turn this to True if "
                         "you know your FreqAI model and strategy do not require historical data."
                     ),