docs: vpath: mark all vpath classes as introduced with upcoming 1.18

src/lib/efl/interfaces/efl_vpath.eo

@@ -15,6 +15,8 @@ interface Efl.Vpath
        "https://blahblah.com/file.jpg"
        "ssh://blahblah.com:~/file.jpg"
        ...
+
+     @since 1.18
    ]]
    legacy_prefix: null;
    eo_prefix: efl_vpath;

src/lib/efl/interfaces/efl_vpath_core.eo

@@ -1,6 +1,9 @@
 class Efl.Vpath.Core (Eo.Base, Efl.Vpath)
 {
-   [[ Core EFL implementation of a Vpath system ]]
+   [[ Core EFL implementation of a Vpath system
+
+   @since 1.18
+   ]]
    legacy_prefix: null;
    eo_prefix: efl_vpath_core;
    methods {

src/lib/efl/interfaces/efl_vpath_file.eo

@@ -11,6 +11,8 @@ class Efl.Vpath_File (Eo.Base)
       fetched or failed event callbacks will be called, inside of which or
       afterwards you can fetch the resulting local file path by getting the
       result property.
+
+      @since 1.18
    ]]
    legacy_prefix: null;
    eo_prefix: efl_vpath_file;

src/lib/efl/interfaces/efl_vpath_file_core.eo

@@ -1,6 +1,9 @@
 class Efl.Vpath_File.Core (Efl.Vpath_File)
 {
-   [[ Core EFL implementation of a Vpath File ]]
+   [[ Core EFL implementation of a Vpath File
+
+   @since 1.18
+   ]]
    legacy_prefix: null;
    eo_prefix: efl_vpath_file_core;
    implements {

src/lib/efl/interfaces/efl_vpath_manager.eo

@@ -1,6 +1,9 @@
 class Efl.Vpath_Manager (Eo.Base)
 {
-   [[ Vpath Manager manages multiple VPath objects that remap/download ]]
+   [[ Vpath Manager manages multiple VPath objects that remap/download
+
+   @since 1.18
+   ]]
    legacy_prefix: null;
    eo_prefix: efl_vpath_manager;
    methods {