Remove doc links to pointer::as_mut

Otherwise these links prevent the docs from compiling due to E0658:

<rust-lang/rust#80896>

Author: michielp1807

lib/dictBuilder/cover.rs

@@ -1210,7 +1210,7 @@ fn COVER_tryParameters(data: Box<COVER_tryParameters_data_t>) {
 ///   of [`core::slice::from_raw_parts`].
 /// - `sum(samplesSizes)` is 0 or `samplesBuffer` and `sum(samplesSizes)` satisfy the requirements
 ///   of [`core::slice::from_raw_parts`].
-/// - `parameters` satisfies the requirements of [`pointer::as_mut`]
+/// - `parameters` satisfies the requirements of `pointer::as_mut`
 #[cfg_attr(feature = "export-symbols", export_name = crate::prefix!(ZDICT_optimizeTrainFromBuffer_cover))]
 pub unsafe extern "C" fn ZDICT_optimizeTrainFromBuffer_cover(
     dictBuffer: *mut core::ffi::c_void,

lib/dictBuilder/fastcover.rs

@@ -614,7 +614,7 @@ fn train_from_buffer_fastcover(
 ///   of [`core::slice::from_raw_parts`].
 /// - `sum(samplesSizes)` is 0 or `samplesBuffer` and `sum(samplesSizes)` satisfy the requirements
 ///   of [`core::slice::from_raw_parts`].
-/// - `parameters` satisfies the requirements of [`pointer::as_mut`]
+/// - `parameters` satisfies the requirements of `pointer::as_mut`
 #[cfg_attr(feature = "export-symbols", export_name = crate::prefix!(ZDICT_optimizeTrainFromBuffer_fastCover))]
 pub unsafe extern "C" fn ZDICT_optimizeTrainFromBuffer_fastCover(
     dictBuffer: *mut core::ffi::c_void,