fix typo in docs, set disablewebgl to true to disable (#3246)

Author: sawka

docs/docs/config.mdx

@@ -60,7 +60,7 @@ wsh editconfig
 | conn:localhostdisplayname <VersionBadge version="v0.14" />           | string   | override the display name for localhost in the UI (e.g., set to "My Laptop" or "Local", or set to empty string to hide the name)                                                                                                                                                                       |
 | term:fontsize                        | float    | the fontsize for the terminal block                                                                                                                                                                                                                           |
 | term:fontfamily                      | string   | font family to use for terminal block                                                                                                                                                                                                                         |
-| term:disablewebgl                    | bool     | set to false to disable WebGL acceleration in terminal                                                                                                                                                                                                        |
+| term:disablewebgl                    | bool     | set to true to disable WebGL acceleration in terminal (default false)                                                                                                                                                                                                        |
 | term:localshellpath                  | string   | set to override the default shell path for local terminals                                                                                                                                                                                                    |
 | term:localshellopts                  | string[] | set to pass additional parameters to the term:localshellpath (example: `["-NoLogo"]` for PowerShell will remove the copyright notice)                                                                                                                         |
 | term:copyonselect                    | bool     | set to false to disable terminal copy-on-select                                                                                                                                                                                                               |