Reference-manual.md:add missing equal sign in "both_libraries" section
[skip ci]
@@ -138,7 +138,7 @@ are never run in parallel.
### both_libraries()
``` meson
- buildtarget both_libraries(library_name, list_of_sources, ...)
+ buildtarget = both_libraries(library_name, list_of_sources, ...)
```
Builds both a static and shared library with the given
