Update OTA guide link currently broken (CON-1589)

[leandropg]

In the section 2.8 Matter OTA of the documentation, there is a link to follow the guide in the connectedhomeip repository. But this link is broken:

esp-matter/docs/en/developing.rst

Lines 1201 to 1204 in 51e5f95

	Please follow the `guide <https://github.com/project-chip/connectedhomeip/blob/master/docs/guides/esp32/ota.md>`__
	in the connectedhomeip repository for generating a Matter OTA image and performing OTA.

The reason is that those documents were moved to new locations based in the platform. You need update it to this new link:

https://github.com/project-chip/connectedhomeip/blob/master/docs/platforms/esp32/ota.md

Thanks in advance.

[shubhamdp]

Thank you for raising the issue, will fix it soon.

[shubhamdp]

@leandropg fixed this link and also few more that were broken in 5cb96e8.