[C API][DOC][PPP] Extend user documentation for new preproprocess api (#14008)

* [C API][DOC] correct the doxy group for ppp

Signed-off-by: xuejun <Xuejun.Zhai@intel.com>

* [C API][DOC] improve the C API doc with new PPP interface

Signed-off-by: xuejun <Xuejun.Zhai@intel.com>

Signed-off-by: xuejun <Xuejun.Zhai@intel.com>

docs/snippets/ov_preprocessing_migration.c

@@ -18,6 +18,7 @@ int main_new() {
     ov_preprocess_prepostprocessor_t* preprocess = NULL;
     ov_preprocess_input_info_t* input_info = NULL;
     ov_preprocess_input_model_info_t* input_model = NULL;
+    ov_preprocess_preprocess_steps_t* input_process = NULL;
     ov_layout_t* layout = NULL;
     ov_model_t* new_model = NULL;
 
@@ -27,12 +28,17 @@ int main_new() {
     // we only need to know where is C dimension
     ov_layout_create("...C", &layout);
     ov_preprocess_input_model_info_set_layout(input_model, layout);
+    // specify scale and mean values, order of operations is important
+    ov_preprocess_input_info_get_preprocess_steps(input_info, &input_process);
+    ov_preprocess_preprocess_steps_mean(input_process, 116.78f);
+    ov_preprocess_preprocess_steps_scale(input_process, 57.21f);
     // insert preprocessing operations to the 'model'
     ov_preprocess_prepostprocessor_build(preprocess, &new_model);
 
     ov_layout_free(layout);
     ov_model_free(new_model);
     ov_preprocess_input_model_info_free(input_model);
+    ov_preprocess_preprocess_steps_free(input_process);
     ov_preprocess_input_info_free(input_info);
     ov_preprocess_prepostprocessor_free(preprocess);
     //! [ov_mean_scale]

src/bindings/c/include/openvino/c/ov_prepostprocess.h

@@ -214,7 +214,7 @@ ov_preprocess_preprocess_steps_resize(
 
 /**
  * @brief Add scale preprocess operation. Divide each element of input by specified value.
- * @ingroup prepostprocess
+ * @ingroup ov_prepostprocess_c_api
  * @param preprocess_input_process_steps A pointer to ov_preprocess_preprocess_steps_t.
  * @param value Scaling value
  * @return Status code of the operation: OK(0) for success.
@@ -224,7 +224,7 @@ ov_preprocess_preprocess_steps_scale(ov_preprocess_preprocess_steps_t* preproces
 
 /**
  * @brief Add mean preprocess operation. Subtract specified value from each element of input.
- * @ingroup prepostprocess
+ * @ingroup ov_prepostprocess_c_api
  * @param preprocess_input_process_steps A pointer to ov_preprocess_preprocess_steps_t.
  * @param value Value to subtract from each element.
  * @return Status code of the operation: OK(0) for success.
@@ -234,7 +234,7 @@ ov_preprocess_preprocess_steps_mean(ov_preprocess_preprocess_steps_t* preprocess
 
 /**
  * @brief Crop input tensor between begin and end coordinates.
- * @ingroup prepostprocess
+ * @ingroup ov_prepostprocess_c_api
  * @param preprocess_input_process_steps A pointer to ov_preprocess_preprocess_steps_t.
  * @param begin Pointer to begin indexes for input tensor cropping.
  * Negative values represent counting elements from the end of input tensor
@@ -251,7 +251,7 @@ ov_preprocess_preprocess_steps_crop(ov_preprocess_preprocess_steps_t* preprocess
 
 /**
  * @brief Add 'convert layout' operation to specified layout.
- * @ingroup prepostprocess
+ * @ingroup ov_prepostprocess_c_api
  * @param preprocess_input_process_steps A pointer to ov_preprocess_preprocess_steps_t.
  * @param layout A point to ov_layout_t
  * @return Status code of the operation: OK(0) for success.
@@ -261,7 +261,7 @@ ov_preprocess_preprocess_steps_convert_layout(ov_preprocess_preprocess_steps_t*
 
 /**
  * @brief Reverse channels operation.
- * @ingroup prepostprocess
+ * @ingroup ov_prepostprocess_c_api
  * @param preprocess_input_process_steps A pointer to ov_preprocess_preprocess_steps_t.
  * @return Status code of the operation: OK(0) for success.
  */