Use single backticks in docstrings

Author: Kludex

src/mcp/shared/_otel.py

@@ -28,10 +28,10 @@ def otel_span(
 
 
 def inject_trace_context(meta: dict[str, Any]) -> None:
-    """Inject W3C trace context (traceparent/tracestate) into a ``_meta`` dict."""
+    """Inject W3C trace context (traceparent/tracestate) into a `_meta` dict."""
     inject(meta)
 
 
 def extract_trace_context(meta: dict[str, Any]) -> Context:
-    """Extract W3C trace context from a ``_meta`` dict."""
+    """Extract W3C trace context from a `_meta` dict."""
     return extract(meta)