doc: stm32: fix doxygen syntax

Missing endgroups, some accidental syntax errors/unknown commands.

include/libopencm3/stm32/l1/gpio.h

@@ -163,10 +163,10 @@ LGPL License Terms @ref lgpl_license
 /* Output type (OTx values) */
 /** @defgroup gpio_output_type GPIO Output Pin Driver Type
 @ingroup gpio_defines
-@list Push Pull
-@list Open Drain
 @{*/
+/** Push-Pull */
 #define GPIO_OTYPE_PP			0x0
+/** Open Drain */
 #define GPIO_OTYPE_OD			0x1
 /**@}*/
 

lib/stm32/common/adc_common_v2.c

@@ -354,3 +354,4 @@ void adc_start_conversion_regular(uint32_t adc)
 	while (ADC_CR(adc) & ADC_CR_ADSTART);
 }
 
+/**@}*/

lib/stm32/common/adc_common_v2_multi.c

@@ -127,3 +127,5 @@ void adc_set_regular_sequence(uint32_t adc, uint8_t length, uint8_t channel[])
 	ADC_SQR3(adc) = reg32_3;
 	ADC_SQR4(adc) = reg32_4;
 }
+
+/**@}*/

lib/stm32/common/usart_common_v2.c

@@ -90,7 +90,7 @@ void usart_disable_tx_inversion(uint32_t usart)
 
  RX pin signal values are inverted. (VDD =0/mark, Gnd=1/idle).
 
- @This bit field can only be written when the USART is disabled.
+ This bit field can only be written when the USART is disabled.
 
  @param[in] usart USART block register address base @ref usart_reg_base
  */
@@ -104,7 +104,7 @@ void usart_enable_rx_inversion(uint32_t usart)
 
  RX pin signal works using the standard logic levels (VDD =1/idle, Gnd=0/mark)
 
- @This bit field can only be written when the USART is disabled.
+ This bit field can only be written when the USART is disabled.
 
  @param[in] usart USART block register address base @ref usart_reg_base
  */
@@ -127,7 +127,7 @@ void usart_disable_rx_inversion(uint32_t usart)
  Apart from this, the communication protocol is similar to normal USART mode.
  Any conflicts on the line must be managed by software
 
- @This bit field can only be written when the USART is disabled.
+ This bit field can only be written when the USART is disabled.
 
  @param[in] usart USART block register address base @ref usart_reg_base
  */
@@ -139,7 +139,7 @@ void usart_enable_halfduplex(uint32_t usart)
 /*---------------------------------------------------------------------------*/
 /** @brief USART Disable Half-duplex
 
- @This bit field can only be written when the USART is disabled.
+ This bit field can only be written when the USART is disabled.
 
  @param[in] usart USART block register address base @ref usart_reg_base
  */