docs: Add missing closing ` in reference manual
@@ -2226,7 +2226,7 @@ an external dependency with the following methods:
- sources: any compiled or static sources the dependency has
- `get_variable(cmake : str, pkgconfig : str, configtool : str,
- default_value : str, pkgconfig_define : [str, str]) *(Added in
+ default_value : str, pkgconfig_define : [str, str])` *(Added in
0.51.0)* A generic variable getter method, which repalces the
get_*type*_variable methods. This allows one to get the variable
from a dependency without knowing specifically how that dependency
