Update '01-adc/README.md'

01-adc/README.md

@@ -95,9 +95,9 @@ multiple conversions in a row, with channels arranged in order according to
 the `SQR` registers.
 
 We are doing a single conversion of a single channel, channel one. So, we
-write a `1` for the first sequence channel. By setting the register with an
+write a `1` for the first sequence channel. By setting the whole register with
-`=` instead of just setting bits, we clear the L field of the register to zero
+`=`, we clear the L field of the register to zero; this sets the sequence length
-which sets a sequence length of one.
+to one.
 
 ```cpp
 ADC1->SQR1 = 1 << ADC_SQR1_SQ1_Pos;