doc: avoid plugin interface strings getting out of sync with docs.

src/Magnum/Audio/AbstractImporter.cpp

@@ -38,7 +38,11 @@
 namespace Magnum { namespace Audio {
 
 std::string AbstractImporter::pluginInterface() {
-    return "cz.mosra.magnum.Audio.AbstractImporter/0.1";
+    return
+/* [interface] */
+"cz.mosra.magnum.Audio.AbstractImporter/0.1"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Audio/AbstractImporter.h

@@ -123,9 +123,7 @@ class MAGNUM_AUDIO_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Audio.AbstractImporter/0.1"
-         * @endcode
+         * @snippet Magnum/Audio/AbstractImporter.cpp interface
          */
         static std::string pluginInterface();
 

src/Magnum/Text/AbstractFont.cpp

@@ -43,7 +43,11 @@
 namespace Magnum { namespace Text {
 
 std::string AbstractFont::pluginInterface() {
-    return "cz.mosra.magnum.Text.AbstractFont/0.3";
+    return
+/* [interface] */
+"cz.mosra.magnum.Text.AbstractFont/0.3"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Text/AbstractFont.h

@@ -184,9 +184,7 @@ class MAGNUM_TEXT_EXPORT AbstractFont: public PluginManager::AbstractPlugin {
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Text.AbstractFont/0.3"
-         * @endcode
+         * @snippet Magnum/Text/AbstractFont.cpp interface
          */
         static std::string pluginInterface();
 

src/Magnum/Text/AbstractFontConverter.cpp

@@ -58,7 +58,11 @@ std::u32string uniqueUnicode(const std::string& characters)
 }
 
 std::string AbstractFontConverter::pluginInterface() {
-    return "cz.mosra.magnum.Text.AbstractFontConverter/0.2";
+    return
+/* [interface] */
+"cz.mosra.magnum.Text.AbstractFontConverter/0.2"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Text/AbstractFontConverter.h

@@ -168,9 +168,7 @@ class MAGNUM_TEXT_EXPORT AbstractFontConverter: public PluginManager::AbstractPl
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Text.AbstractFontConverter/0.2"
-         * @endcode
+         * @snippet Magnum/Text/AbstractFontConverter.cpp interface
          */
         static std::string pluginInterface();
 

src/Magnum/Trade/AbstractImageConverter.cpp

@@ -43,7 +43,11 @@
 namespace Magnum { namespace Trade {
 
 std::string AbstractImageConverter::pluginInterface() {
-    return "cz.mosra.magnum.Trade.AbstractImageConverter/0.2.1";
+    return
+/* [interface] */
+"cz.mosra.magnum.Trade.AbstractImageConverter/0.2.1"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Trade/AbstractImageConverter.h

@@ -206,9 +206,7 @@ class MAGNUM_TRADE_EXPORT AbstractImageConverter: public PluginManager::Abstract
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Trade.AbstractImageConverter/0.2.1"
-         * @endcode
+         * @snippet Magnum/Trade/AbstractImageConverter.cpp interface
          */
         static std::string pluginInterface();
 

src/Magnum/Trade/AbstractImporter.cpp

@@ -59,7 +59,11 @@
 namespace Magnum { namespace Trade {
 
 std::string AbstractImporter::pluginInterface() {
-    return "cz.mosra.magnum.Trade.AbstractImporter/0.3.2";
+    return
+/* [interface] */
+"cz.mosra.magnum.Trade.AbstractImporter/0.3.2"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Trade/AbstractImporter.h

@@ -336,9 +336,7 @@ class MAGNUM_TRADE_EXPORT AbstractImporter: public PluginManager::AbstractManagi
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Trade.AbstractImporter/0.3.2"
-         * @endcode
+         * @snippet Magnum/Trade/AbstractImporter.cpp interface
          */
         static std::string pluginInterface();
 

src/Magnum/Trade/AbstractSceneConverter.cpp

@@ -41,7 +41,11 @@
 namespace Magnum { namespace Trade {
 
 std::string AbstractSceneConverter::pluginInterface() {
-    return "cz.mosra.magnum.Trade.AbstractSceneConverter/0.1";
+    return
+/* [interface] */
+"cz.mosra.magnum.Trade.AbstractSceneConverter/0.1"
+/* [interface] */
+    ;
 }
 
 #ifndef CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT

src/Magnum/Trade/AbstractSceneConverter.h

@@ -180,9 +180,7 @@ class MAGNUM_TRADE_EXPORT AbstractSceneConverter: public PluginManager::Abstract
         /**
          * @brief Plugin interface
          *
-         * @code{.cpp}
-         * "cz.mosra.magnum.Trade.AbstractSceneConverter/0.1"
-         * @endcode
+         * @snippet Magnum/Trade/AbstractSceneConverter.cpp interface
          */
         static std::string pluginInterface();