correct the URL and f-strings format (#11)

Signed-off-by: Chen Lihui <[email protected]>

rpyutils/import_c_library.py

@@ -44,12 +44,12 @@ def import_c_library(name: str, package: Optional[str] = None):
             expected_path = Path(__file__).parents[1] / (
                 name[1:] + sysconfig.get_config_var('EXT_SUFFIX'))
             assert not expected_path.is_file()
-            link = f'https://docs.ros.org/en/{distro}/Guides/Installation-Troubleshooting.html#import-failing-without-library-present-on-the-system'  # noqa: E501
+            link = f'https://docs.ros.org/en/{distro}/How-To-Guides/Installation-Troubleshooting.html#import-failing-without-library-present-on-the-system'  # noqa: E501
             e.msg += \
                 f"\nThe C extension '{expected_path}' isn't present on the " \
                 f"system. Please refer to '{link}' for possible solutions"
         if e.path is not None and os.path.isfile(e.path):
-            link = 'https://docs.ros.org/en/{distro}/Guides/Installation-Troubleshooting.html#import-failing-even-with-library-present-on-the-system'  # noqa: E501
+            link = f'https://docs.ros.org/en/{distro}/How-To-Guides/Installation-Troubleshooting.html#import-failing-even-with-library-present-on-the-system'  # noqa: E501
             e.msg += \
                 f"\nThe C extension '{e.path}' failed to be imported while " \
                 f"being present on the system. Please refer to '{link}' for " \