Document what types are possible for get and put

bus/m_epics_ca.h

@@ -96,6 +96,16 @@ template <typename T> class mEpicsCa {
      * for `T` depending on the record type (for an enum record with `T =
      * uint16_t`, `std::string` is a valid "alias"). The corresponding string or
      * uint value is then put into `value`.
+     *
+     * Supported types for V are:
+     * - `int`
+     * - `short`
+     * - `long`
+     * - `uint16_t`
+     * - `float`
+     * - `double`
+     * - `std::string`
+     * For char arrays, use `mEpicsCa::get(char *buf, u_long len)` instead.
      * @param value Pointer which gets populated with the channel value if
      * reading succeeded.
      * @return int MIDAS status error code as defined in midas.h.
@@ -118,6 +128,16 @@ template <typename T> class mEpicsCa {
      *
      * @tparam V Type of the `value` pointer, which needs to be a valid "alias"
      * for `T`, see `mEpicsCa::get`. This is checked during instantiation.
+     *
+     * Supported types for V are:
+     * - `int`
+     * - `short`
+     * - `long`
+     * - `uint16_t`
+     * - `float`
+     * - `double`
+     * - `std::string`
+     * For char arrays, use `mEpicsCa::put(char *buf, u_long len)` instead.
      * @param value Pointer to the new value which gets written to the channel.
      * @return int MIDAS status error code as defined in midas.h.
      */