Auto merge of #70499 - Dylan-DPC:rollup-f9je1l8, r=Dylan-DPC

Rollup of 5 pull requests

Successful merges:

 - #70418 (Add long error explanation for E0703)
 - #70448 (Create output dir in rustdoc markdown render)
 - #70486 (Shrink Unicode tables (even more))
 - #70493 (Fix rustdoc.css CSS tab-size property)
 - #70495 (Replace last mention of IRC with Discord)

Failed merges:

r? @ghost

1 files changed, 17 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0703.md b/src/librustc_error_codes/error_codes/E0703.md
new file mode 100644
index 00000000000..b42677d52cb
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0703.md
@@ -0,0 +1,17 @@
+Invalid ABI (Application Binary Interface) used in the code.
+
+Erroneous code example:
+
+```compile_fail,E0703
+extern "invalid" fn foo() {} // error!
+# fn main() {}
+```
+
+At present few predefined ABI's (like Rust, C, system, etc.) can be
+used in Rust. Verify that the ABI is predefined. For example you can
+replace the given ABI from 'Rust'.
+
+```
+extern "Rust" fn foo() {} // ok!
+# fn main() { }
+```