some more doc fixes

src/time/mod.rs

@@ -206,7 +206,7 @@ pub trait TimeReader {
 
 /// Trait for generic CCSDS time providers.
 ///
-/// The UNIX helper methods and the [date_time] method are not strictly necessary but extremely
+/// The UNIX helper methods and the [Self::date_time] method are not strictly necessary but extremely
 /// practical because they are a very common and simple exchange format for time information.
 pub trait CcsdsTimeProvider {
     fn len_as_bytes(&self) -> usize;

src/tm.rs

@@ -123,7 +123,7 @@ impl<'stamp> PusTmSecondaryHeader<'stamp> {
         Self::new(service, subservice, 0, 0, Some(timestamp))
     }
 
-    /// Like [new_simple] but without a timestamp.
+    /// Like [Self::new_simple] but without a timestamp.
     pub fn new_simple_no_timestamp(service: u8, subservice: u8) -> Self {
         Self::new(service, subservice, 0, 0, None)
     }