docs: Mention GioUnix-2.0 GIR namespace alongside gio-unix-2.0.pc

This should clarify things a little for users of language bindings, who
don’t directly use `.pc` files.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

docs/reference/gio/overview.md

@@ -234,8 +234,8 @@ information on how to use pkg-config to compile your application.
 
 If you are using GIO on UNIX-like systems, you may want to use UNIX-specific
 GIO interfaces such as `GUnixInputStream`, `GUnixOutputStream`, `GUnixMount`
-or `GDesktopAppInfo`. To do so, use the `gio-unix-2.0.pc` file instead of
-`gio-2.0.pc`.
+or `GDesktopAppInfo`. To do so, use the `gio-unix-2.0.pc` file as well as
+`gio-2.0.pc` (or, in GIR namespace terms, `GioUnix-2.0` as well as `Gio-2.0`).
 
 ## Running GIO applications
 

docs/reference/gio/unix-mounts.md

@@ -9,7 +9,7 @@ Routines for managing mounted UNIX mount points and paths.
 
 Note that `<gio/gunixmounts.h>` belongs to the UNIX-specific GIO
 interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config
-file when using it.
+file or the `GioUnix-2.0` GIR namespace when using it.
 
 There are three main classes:
 

gio/gdesktopappinfo.c

@@ -70,7 +70,7 @@
  *
  * Note that `<gio/gdesktopappinfo.h>` belongs to the UNIX-specific
  * GIO interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config
- * file when using it.
+ * file or the `GioUnix-2.0` GIR namespace when using it.
  */
 
 #define DEFAULT_APPLICATIONS_GROUP  "Default Applications"

gio/gfiledescriptorbased.c

@@ -35,7 +35,7 @@
  *
  * Note that `<gio/gfiledescriptorbased.h>` belongs to the UNIX-specific
  * GIO interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config
- * file when using it.
+ * file or the `GioUnix-2.0` GIR namespace when using it.
  *
  * Since: 2.24
  **/

gio/gunixfdmessage.c

@@ -29,7 +29,7 @@
  *
  * Note that `<gio/gunixfdmessage.h>` belongs to the UNIX-specific GIO
  * interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config
- * file when using it.
+ * file or the `GioUnix-2.0` GIR namespace when using it.
  */
 
 #include "config.h"

gio/gunixinputstream.c

@@ -49,7 +49,7 @@
  *
  * Note that `<gio/gunixinputstream.h>` belongs to the UNIX-specific GIO
  * interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config
- * file when using it.
+ * file or the `GioUnix-2.0` GIR namespace when using it.
  */
 
 enum {

gio/gunixoutputstream.c

@@ -51,7 +51,7 @@
  *
  * Note that `<gio/gunixoutputstream.h>` belongs to the UNIX-specific GIO
  * interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config file
- * when using it.
+ * file or the `GioUnix-2.0` GIR namespace when using it.
  */
 
 enum {