doc: update files to main for NCS 2.5.1

Updating known issues and adding release notes
to the main branch.

Signed-off-by: divya pillai <divya.pillai@nordicsemi.no>

Author: divipillai

doc/nrf/links.txt

@@ -232,6 +232,7 @@
 .. _`nRF Connect SDK latest documentation`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/index.html
 
 .. _`known issues page on the main branch`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/releases_and_maturity/known_issues.html
+.. _`known issues for nRF Connect SDK v2.5.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/releases_and_maturity/known_issues.html?v=v2-5-1
 .. _`known issues for nRF Connect SDK v2.5.0`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/releases_and_maturity/known_issues.html?v=v2-5-0
 .. _`known issues for nRF Connect SDK v2.4.2`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/releases_and_maturity/known_issues.html?v=v2-4-2
 .. _`known issues for nRF Connect SDK v2.4.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/releases_and_maturity/known_issues.html?v=v2-4-1
@@ -313,6 +314,7 @@
 
 .. _`nRF socket options`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfxlib/nrf_modem/doc/sockets.html#socket-options
 
+.. _`Repositories and revisions for v2.5.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.1/nrf/releases_and_maturity/repository_revisions.html
 .. _`Repositories and revisions for v2.5.0`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.0/nrf/introduction.html#ncs-repository-revisions
 .. _`Repositories and revisions for v2.4.2`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.2/nrf/introduction.html#ncs-repository-revisions
 .. _`Repositories and revisions for v2.4.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.1/nrf/introduction.html#ncs-repository-revisions
@@ -331,6 +333,7 @@
 .. _`Repositories and revisions for v1.9.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrf/introduction.html#repositories-and-revisions
 .. _`Repositories and revisions`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.0/nrf/introduction.html#repositories-and-revisions
 
+.. _`Modem library changelog for v2.5.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.1/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
 .. _`Modem library changelog for v2.5.0`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.0/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
 .. _`Modem library changelog for v2.4.2`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.2/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
 .. _`Modem library changelog for v2.4.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.1/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
@@ -349,6 +352,7 @@
 .. _`Modem library changelog for v1.9.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
 .. _`Modem library changelog for v1.9.0`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.0/nrfxlib/nrf_modem/doc/CHANGELOG.html#nrf-modem-changelog
 
+.. _`LwM2M carrier library changelog for v2.5.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.1/nrf/libraries/bin/lwm2m_carrier/CHANGELOG.html#liblwm2m-carrier-changelog
 .. _`LwM2M carrier library changelog for v2.5.0`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.5.0/nrf/libraries/bin/lwm2m_carrier/CHANGELOG.html#liblwm2m-carrier-changelog
 .. _`LwM2M carrier library changelog for v2.4.2`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.2/nrf/libraries/bin/lwm2m_carrier/CHANGELOG.html#liblwm2m-carrier-changelog
 .. _`LwM2M carrier library changelog for v2.4.1`: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.1/nrf/libraries/bin/lwm2m_carrier/CHANGELOG.html#liblwm2m-carrier-changelog

doc/nrf/releases_and_maturity/developing/adding_code.rst

@@ -162,7 +162,7 @@ This is demonstrated by the following code, that would be placed somewhere in yo
        - name: nrf
          repo-path: sdk-nrf
          remote: ncs
-         revision: v2.5.0
+         revision: v2.5.1
          import: true
      self:
        path: application
@@ -189,7 +189,7 @@ For example:
      projects:
        - name: nrf
          remote: ncs
-         revision: v2.5.0
+         revision: v2.5.1
          import: true
        # Example for how to override a repository in the nRF Connect SDK with your own:
        - name: mcuboot