fix(docs): replace unresolvable intra-doc links with code spans

Replace private-item intra-doc links that fail `cargo doc -D warnings`
with equivalent code spans or inline prose:

- `src/resolve/ffi_bridge/mod.rs`: replace `[`FfiAbi::consumers`]` in
  the module doc with inline prose and add an explicit link target for
  `[`FfiAbi`]` to resolve the remaining reference correctly.
- `src/symbol/descriptor.rs`: replace `[is_simple_ident_char]` (private
  fn, not re-exported) with a code span so the doc compiles cleanly.

Author: farhan-syah

src/resolve/ffi_bridge/mod.rs

@@ -6,8 +6,8 @@
 //! `#[no_mangle]` function is callable from C under a stable linker name, and a
 //! PyO3 `#[pyfunction]` is callable from Python. The extractor records each as a
 //! neutral [`FfiExport`] fact (tagged with its [`FfiAbi`]); this resolver bridges
-//! it to call sites in a language that **consumes that ABI**
-//! ([`FfiAbi::consumers`]) — so a C call binds to a C-ABI export, a Python call
+//! it to call sites in a language that **consumes that ABI** (the ABI's consumer
+//! set) — so a C call binds to a C-ABI export, a Python call
 //! to a Python-ABI export, never crossed.
 //!
 //! It is the honest, deterministic subset of cross-language linking: the export
@@ -29,6 +29,7 @@
 //! [`Confidence::NameOnly`]: crate::graph::Confidence::NameOnly
 //! [`Provenance::FfiBridge`]: crate::graph::Provenance::FfiBridge
 //! [`FfiExport`]: crate::graph::FfiExport
+//! [`FfiAbi`]: crate::graph::FfiAbi
 
 mod resolver;
 

src/symbol/descriptor.rs

@@ -31,7 +31,7 @@ pub enum Descriptor {
     Term(String),
     /// A method or free function (`ident(disambiguator).`). The `disambiguator`
     /// distinguishes overloads and **must** be a SCIP *simple-identifier* (chars
-    /// per [`is_simple_ident_char`]) or empty: SCIP's grammar is
+    /// per `is_simple_ident_char`) or empty: SCIP's grammar is
     /// `method-disambiguator ::= simple-identifier?` with **no escaped form**, so
     /// a non-simple disambiguator cannot be rendered to a parseable SCIP string.
     /// Empty disambiguator is the common case.