Convert ABI "details" links to lists

For each of the ABIs, we have outbound links to documents with more
details.  For most of these, we display the URL, since these URLs are
short and readable enough that it's probably more informative to just
show them as compared to trying to describe the document.  However,
the URLs are still long enough that they look better as list items, so
let's switch to doing it that way.

Author: traviscross

src/items/external-blocks.md

@@ -141,15 +141,21 @@ r[items.extern.abi.cdecl]
   * Corresponds to MSVC's `__cdecl` and GCC and clang's `__attribute__((cdecl))`.
 
   > [!NOTE]
-  > See <https://learn.microsoft.com/en-us/cpp/cpp/cdecl> and <https://en.wikipedia.org/wiki/X86_calling_conventions#cdecl> for more information.
+  > For details, see:
+  >
+  > - <https://learn.microsoft.com/en-us/cpp/cpp/cdecl>
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#cdecl>
 
 r[items.extern.abi.stdcall]
 * `unsafe extern "stdcall"` --- The calling convention typically used by the [Win32 API] on x86_32.
   * Only available on x86_32 targets.
   * Corresponds to MSVC's `__stdcall` and GCC and clang's `__attribute__((stdcall))`.
 
   > [!NOTE]
-  > See <https://learn.microsoft.com/en-us/cpp/cpp/stdcall> and <https://en.wikipedia.org/wiki/X86_calling_conventions#stdcall> for more information.
+  > For details, see:
+  >
+  > - <https://learn.microsoft.com/en-us/cpp/cpp/stdcall>
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#stdcall>
 
 r[items.extern.abi.win64]
 * `unsafe extern "win64"` --- The Windows x64 ABI.
@@ -158,7 +164,10 @@ r[items.extern.abi.win64]
   * Corresponds to GCC and clang's `__attribute__((ms_abi))`.
 
   > [!NOTE]
-  > See <https://learn.microsoft.com/en-us/cpp/build/x64-software-conventions> and <https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_x64_calling_convention> for more information.
+  > For details, see:
+  >
+  > - <https://learn.microsoft.com/en-us/cpp/build/x64-software-conventions>
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_x64_calling_convention>
 
 r[items.extern.abi.sysv64]
 * `unsafe extern "sysv64"` --- The System V ABI.
@@ -167,7 +176,10 @@ r[items.extern.abi.sysv64]
   * Corresponds to GCC and clang's `__attribute__((sysv_abi))`.
 
   > [!NOTE]
-  > See <https://wiki.osdev.org/System_V_ABI> or <https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI> for more information.
+  > For details, see:
+  >
+  > - <https://wiki.osdev.org/System_V_ABI>
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI>
 
 r[items.extern.abi.aapcs]
 * `unsafe extern "aapcs"` --- The soft-float ABI for ARM.
@@ -176,23 +188,31 @@ r[items.extern.abi.aapcs]
   * Corresponds to clang's `__attribute__((pcs("aapcs")))`.
 
   > [!NOTE]
-  > See [Arm Procedure Call Standard](https://developer.arm.com/documentation/107656/0101/Getting-started-with-Armv8-M-based-systems/Procedure-Call-Standard-for-Arm-Architecture--AAPCS-) for more information.
+  > For details, see:
+  >
+  > - [Arm Procedure Call Standard](https://developer.arm.com/documentation/107656/0101/Getting-started-with-Armv8-M-based-systems/Procedure-Call-Standard-for-Arm-Architecture--AAPCS-)
 
 r[items.extern.abi.fastcall]
 * `unsafe extern "fastcall"` --- A "fast" variant of stdcall that passes some arguments in registers.
   * Only available on x86_32 targets.
   * Corresponds to MSVC's `__fastcall` and GCC and clang's `__attribute__((fastcall))`.
 
   > [!NOTE]
-  > See <https://learn.microsoft.com/en-us/cpp/cpp/fastcall> and <https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_fastcall> for more information.
+  > For details, see:
+  >
+  > - <https://learn.microsoft.com/en-us/cpp/cpp/fastcall>
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#Microsoft_fastcall>
 
 r[items.extern.abi.thiscall]
 * `unsafe extern "thiscall"` --- The calling convention typically used on C++ class member functions on x86_32 MSVC.
   * Only available on x86_32 targets.
   * Corresponds to MSVC's `__thiscall` and GCC and clang's `__attribute__((thiscall))`.
 
   > [!NOTE]
-  > See <https://en.wikipedia.org/wiki/X86_calling_conventions#thiscall> and <https://learn.microsoft.com/en-us/cpp/cpp/thiscall> for more information.
+  > For details, see:
+  >
+  > - <https://en.wikipedia.org/wiki/X86_calling_conventions#thiscall>
+  > - <https://learn.microsoft.com/en-us/cpp/cpp/thiscall>
 
 r[items.extern.abi.efiapi]
 * `unsafe extern "efiapi"` --- The ABI used for [UEFI] functions.