Revert "doc: posix: mark posis fd mgmt as supported"

PR #73978 introduced a regression.
Unfortunately this PR cannot be reverted without reverting also
Let's revert both PRs to stabilize main again towards the 3.7 release.

For more details on the issue see
https://github.com/zephyrproject-rtos/zephyr/issues/75205

This reverts commit e9b676a9ab.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

doc/services/portability/posix/aep/index.rst

@@ -101,7 +101,7 @@ The *Realtime Controller System Profile* (PSE52) includes all features from PSE5
    :widths: 50, 10, 50
 
     :ref:`POSIX_C_LANG_MATH <posix_option_group_c_lang_math>`, yes,
-    :ref:`POSIX_FD_MGMT <posix_option_group_fd_mgmt>`, yes, :kconfig:option:`CONFIG_POSIX_FD_MGMT`
+    :ref:`POSIX_FD_MGMT <posix_option_group_fd_mgmt>`,, :kconfig:option:`CONFIG_POSIX_FD_MGMT`
     :ref:`POSIX_FILE_SYSTEM <posix_option_group_file_system>`,, :kconfig:option:`CONFIG_POSIX_FILE_SYSTEM`
 
 .. csv-table:: PSE52 Option Requirements

doc/services/portability/posix/option_groups/index.rst

@@ -546,26 +546,24 @@ POSIX_TIMERS
 POSIX_FD_MGMT
 =============
 
-.. note::
-   When using Newlib, Picolibc, or other C libraries conforming to the ISO C Standard, the
-   C89 components of the ``POSIX_FD_MGMT`` Option Group are considered supported.
+This table lists service support status in Zephyr for `POSIX_FD_MGMT`:
 
 .. csv-table:: POSIX_FD_MGMT
    :header: API, Supported
    :widths: 50,10
 
-    dup(), yes
-    dup2(), yes
-    fcntl(), yes
-    fgetpos(), yes
-    fseek(), yes
-    fseeko(), yes
-    fsetpos(), yes
-    ftell(), yes
-    ftello(), yes
+    dup(),
+    dup2(),
+    fcntl(),
+    fgetpos(),
+    fseek(),
+    fseeko(),
+    fsetpos(),
+    ftell(),
+    ftello(),
     ftruncate(),yes
-    lseek(), yes
-    rewind(), yes
+    lseek(),
+    rewind(),
 
 .. _posix_option_group_file_locking: