feat(js): Add ignoreSpans documentation to Options page (#14572)

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## DESCRIBE YOUR PR

Adds documentation for the new `ignoreSpans` option to be released with
SDK version 10.2.0.

SDK PR: getsentry/sentry-javascript#16820
Develop Docs spec change:
#14571

closes #14569 

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---------

Co-authored-by: Alex Krawiec <[email protected]>

Author: Lms24

docs/platforms/javascript/common/configuration/options.mdx

@@ -433,6 +433,16 @@ Please note that the `span` you receive as an argument is a serialized object, n
 
 </SdkOption>
 
+<SdkOption name="ignoreSpans" type='Array<string | RegExp | {name?: string | RegExp, op?: string | RegExp}>' defaultValue='[]'>
+
+A list of strings or regex patterns matching span names that shouldn't be sent to Sentry. When using strings, partial matches will be filtered out, so if you need to filter by exact match, use regex patterns instead. You can also provide an object with a `name` and `op` property to match both the span name and the operation name. Note that at least `name` or `op` must be provided.
+
+If a root span matches any of the specified patterns, the entire local trace will be dropped. If a child span matches, its children will be reparented to the dropped span's parent span. 
+
+By default, no spans are ignored.
+
+</SdkOption>
+
 ## Session Replay Options
 
 <SdkOption name="replaysSessionSampleRate" type='number' categorySupported={['browser']}>