Update learn/sequencing/overview.md

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: pthmas

learn/sequencing/overview.md

@@ -23,7 +23,7 @@ It mainly consists of:
 ## Sequencing Implementations {#sequencing-implementations}
 
 An implementation of the sequencing interface mainly acts as a middleware that connects Rollkit rollup and the sequencing layer. It implements the sequencing interface functions described above.
-There are several implementations of the sequencor:
+There are several implementations of the sequencer:
 
 * [single-sequencer](/learn/sequencing/single.md) - The simplest and most widely used sequencing model, where a single node (the sequencer) is responsible for ordering transactions and producing blocks.