Update documentation for symbol visibility.symvisibility

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+## Keyword argument for symbol visibility
+
+Build targets got a new keyword, `symbol_visibility` that controls how
+symbols are exported from shared libraries. This is most commonly used
+to hide implementation symbols like this:
+
+```meson
+shared_library('mylib', ...
+  symbol_visibility: 'hidden')
+```
+
+In this case only symbols explicitly marked as visible in the source
+files get exported.