cmake-presets: Remove incorrect documentation for `installDir`

Help/manual/presets/schema.json

@@ -89,7 +89,7 @@
           },
           "installDir": {
             "type": "string",
-            "description": "An optional string representing the path to the output binary directory. This field supports macro expansion. If a relative path is specified, it is calculated relative to the source directory. If binaryDir is not specified, it must be inherited from the inherits preset (unless this preset is hidden)."
+            "description": "An optional string representing the path to the installation directory. This field supports macro expansion. If a relative path is specified, it is calculated relative to the source directory."
           },
           "condition": { "$ref": "#/definitions/topCondition" }
         }