fix (doc): mismatched closing quote

[mdqst]

spotted a mismatched quote in the ItemInlineMacroWithoutBang message.
the snippet started with a backtick and ended with a single quote.
made them match. nothing else changed.

[reviewable-StarkWare]

This change is 

[orizi]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @mdqst)

---

crates/cairo-lang-parser/src/diagnostic.rs line 180 at r1 (raw file):

                };
                format!(
                    "Expected a '!' after the identifier '{identifier}' to start an inline macro.

run:
CAIRO_FIX_TESTS=1 cargo t --profile=ci-dev -p cairo-lang-parser

to fix test tests as well.