Update trace explorer documentation and images

Author: Shannon Anahata

docs/product/explore/trace-explorer/img/Trace_explorer_low_samples.png

@@ -200,7 +200,7 @@ Sentry treats this as a representation of the average across all 12 estimated sp
 
 If your sampling rate is **too low** for an accurate extrapolation (for example, keeping less than 5% of an already low number of spans), Sentry may show a **low sampling rate warning**. This lets you know that extrapolation might be less reliable, especially for more restrictive queries.
 
-![Trace Explorer Screenshot](./img/Trace_explorer_low_samples.png)
+![Trace Explorer Screenshot](./img/trace_explorer_low_samples.png)
 
 Even if you sample your spans, **Trace Explorer's extrapolation gives you reasonably accurate answers** for counts, averages, and percentiles -- without you needing to do anything extra.