tidy-up: git options, ECH, HTTP/3 documentation

- prefer `--branch` over `-b`, where missing.
- add `--depth 1` where missing.
- sync option order between docs and GHA.
- bump quiche and rustls-ffi versions in documentation.
- ECH.md: update for OpenSSL 4.

Closes #21447

docs/RUSTLS.md

@@ -27,7 +27,7 @@ differ between distributions.
 
 Once installed, build `curl` using `--with-rustls`.
 
-    % git clone https://github.com/curl/curl
+    % git clone --depth 1 https://github.com/curl/curl
     % cd curl
     % autoreconf -fi
     % ./configure --with-rustls
@@ -43,7 +43,7 @@ Download the appropriate archive for your platform and extract it to a directory
 
 Once downloaded, build `curl` using `--with-rustls` and the path to the extracted binaries.
 
-    % git clone https://github.com/curl/curl
+    % git clone --depth 1 https://github.com/curl/curl
     % cd curl
     % autoreconf -fi
     % ./configure --with-rustls=${HOME}/rustls-ffi-built
@@ -63,13 +63,13 @@ To install `cargo-c`, use your [package manager][cargo-c pkg], download
 
 Next, check out, build, and install the appropriate version of `rustls-ffi` using `cargo`:
 
-    % git clone https://github.com/rustls/rustls-ffi -b v0.15.0
+    % git clone --depth 1 --branch v0.15.3 https://github.com/rustls/rustls-ffi
     % cd rustls-ffi
     % cargo capi install --release --prefix=${HOME}/rustls-ffi-built
 
 Now configure and build `curl` using `--with-rustls`:
 
-    % git clone https://github.com/curl/curl
+    % git clone --depth 1 https://github.com/curl/curl
     % cd curl
     % autoreconf -fi
     % ./configure --with-rustls=${HOME}/rustls-ffi-built