Revert use of lt/gt symbols in link

docs/designers-developers/key-concepts.md

@@ -50,7 +50,7 @@ Reusable Blocks are stored as a hidden post type, and are dynamic blocks that "r
 
 At the core of Gutenberg lies the concept of the block. From a technical point of view, blocks both raise the level of abstraction from a single document to a collection of meaningful elements, and they replace ambiguity—inherent in HTML—with explicit structure. A post in Gutenberg is then a _collection of blocks_.
 
-To understand how blocks operate at a data-structure level, let's take a small detour to the simile of the printing press of Johannes Gutenberg. In letterpress, a finished page was assembled from individual characters, a test print made in a [galley](https://en.wikipedia.org/wiki/Galley_proof), and then locked into a [chase](<https://en.wikipedia.org/wiki/Chase_(printing)>) to create a fully formed page. Once printed, there's no need to know whether it was set via individual letters, type slugs from a [linotype machine](https://en.wikipedia.org/wiki/Linotype_machine), or even one giant plate.
+To understand how blocks operate at a data-structure level, let's take a small detour to the simile of the printing press of Johannes Gutenberg. In letterpress, a finished page was assembled from individual characters, a test print made in a [galley](https://en.wikipedia.org/wiki/Galley_proof), and then locked into a [chase](https://en.wikipedia.org/wiki/Chase_(printing)) to create a fully formed page. Once printed, there's no need to know whether it was set via individual letters, type slugs from a [linotype machine](https://en.wikipedia.org/wiki/Linotype_machine), or even one giant plate.
 
 This is true for content blocks. They are the way in which the user creates their content, but they no longer matter once the content is finished. That is, until it needs to be edited. Imagine if the printing press was able to print a page _while_ also including in the page the instructions to generate again the set of movable type required to print it. What we are doing with blocks could be compared to printing invisible marks in the margins so that the printer can make adjustments to an already printed page without needing to set the page again from scratch.