Clocks doxygen: Remove incorrect clk_ref auxsrc value LPOSC. LPOSC is a primary source of clk_ref. Fixes issue #2047 (#2052)

Author: liamfraser

src/rp2_common/hardware_clocks/include/hardware/clocks.h

@@ -110,7 +110,7 @@ extern "C" {
  * USB PLL    | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB | CLOCKS_CLK_REF_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB| CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB
  * ROSC       | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_ROSC_CLKSRC    |                                                | CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_ROSC_CLKSRC
  * XOSC       | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_XOSC_CLKSRC    |                                                | CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_XOSC_CLKSRC
- * LPOSC      | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_LPOSC_CLKSRC | CLOCKS_CLK_REF_CTRL_AUXSRC_VALUE_LPOSC_CLKSRC | |
+ * LPOSC      | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_LPOSC_CLKSRC   | | |
  * System clock | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_CLK_SYS      | | |
  * USB Clock  | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_CLK_USB        | | |
  * ADC clock  | CLOCKS_CLK_GPOUTx_CTRL_AUXSRC_VALUE_CLK_ADC        | | |