chore(docs): fix README typo (#5338)

Insert a missing closing backtick.

README.md

@@ -189,7 +189,7 @@ You can configure super-linter using the following environment variables:
 |-------------------------------------------------|---------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | **ANSIBLE_CONFIG_FILE**                         | `.ansible-lint.yml`             | Filename for [Ansible-lint configuration](https://ansible.readthedocs.io/projects/lint/configuring/) (ex: `.ansible-lint`, `.ansible-lint.yml`)                                                                      |
 | **ANSIBLE_DIRECTORY**                           | `/ansible`                      | Flag to set the root directory for Ansible file location(s), relative to `DEFAULT_WORKSPACE`. Set to `.` to use the top-level of the `DEFAULT_WORKSPACE`.                                                            |
-| **BASH_EXEC_IGNORE_LIBRARIES**                  | `false                          | If set to `true`, shell files with a file extension and no shebang line are ignored when checking if the executable bit is set.                                                                                      |
+| **BASH_EXEC_IGNORE_LIBRARIES**                  | `false`                          | If set to `true`, shell files with a file extension and no shebang line are ignored when checking if the executable bit is set.                                                                                      |
 | **BASH_SEVERITY**                               | `style`                         | Specify the minimum severity of errors to consider in shellcheck. Valid values in order of severity are error, warning, info and style.                                                                              |
 | **CHECKOV_FILE_NAME**                           | `.checkov.yaml`                 | Configuration filename for Checkov.                                                                                                                                                                                  |
 | **CREATE_LOG_FILE**                             | `false`                         | If set to `true`, it creates the log file. You can set the log filename using the `LOG_FILE` environment variable. This overrides any existing log files.                                                            |