doc: shorten overlong title underlines

Title underlines should match the length of the title. Unfortunately
docutils only catches underlines that are too short.

Add some missing empty lines after titles.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/board/ti/am62x_beagleplay.rst b/doc/board/ti/am62x_beagleplay.rst
index 39913b2..17738ea 100644
--- a/doc/board/ti/am62x_beagleplay.rst
+++ b/doc/board/ti/am62x_beagleplay.rst
@@ -70,7 +70,7 @@
     :end-before: .. am62x_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
 Copy the below images to an SD card and boot:
 
 * tiboot3-am62x-gp-evm.bin from R5 build as tiboot3.bin
@@ -109,7 +109,7 @@
   depends on the SD card quality.
 
 Flash to uSD card or how to deal with "bricked" Board
---------------------------------------------------------
+-----------------------------------------------------
 
 When deploying or working on Linux, it's common to use the onboard
 eMMC. However, avoiding the eMMC and using the uSD card is safer when
diff --git a/doc/board/ti/am62x_sk.rst b/doc/board/ti/am62x_sk.rst
index d7437c6..4703ce6 100644
--- a/doc/board/ti/am62x_sk.rst
+++ b/doc/board/ti/am62x_sk.rst
@@ -2,7 +2,7 @@
 .. sectionauthor:: Vignesh Raghavendra <vigneshr@ti.com>
 
 AM62 Platforms
-===============
+==============
 
 Introduction:
 -------------
@@ -117,7 +117,8 @@
 .. am62x_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, tispl.bin and u-boot.img.  Each SoC
 variant (GP, HS-FS, HS-SE) requires a different source for these files.
 
diff --git a/doc/board/ti/am64x_evm.rst b/doc/board/ti/am64x_evm.rst
index db27461..69afee0 100644
--- a/doc/board/ti/am64x_evm.rst
+++ b/doc/board/ti/am64x_evm.rst
@@ -107,7 +107,8 @@
 .. am64x_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, tispl.bin and u-boot.img.  Each SoC
 variant (GP, HS-FS, HS-SE) requires a different source for these files.
 
diff --git a/doc/board/ti/am65x_evm.rst b/doc/board/ti/am65x_evm.rst
index bf9e4c4..0e96e31 100644
--- a/doc/board/ti/am65x_evm.rst
+++ b/doc/board/ti/am65x_evm.rst
@@ -117,7 +117,8 @@
 .. am65x_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, sysfw.itb, tispl.bin and u-boot.img.
 Each SoC variant (GP and HS) requires a different source for these files.
 
diff --git a/doc/board/ti/j7200_evm.rst b/doc/board/ti/j7200_evm.rst
index 35b5541..5653c2e 100644
--- a/doc/board/ti/j7200_evm.rst
+++ b/doc/board/ti/j7200_evm.rst
@@ -106,7 +106,8 @@
 .. j7200_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, tispl.bin and u-boot.img. Each SoC
 variant (GP, HS-FS, HS-SE) requires a different source for these files.
 
diff --git a/doc/board/ti/j721e_evm.rst b/doc/board/ti/j721e_evm.rst
index cbb7da6..5f14e45 100644
--- a/doc/board/ti/j721e_evm.rst
+++ b/doc/board/ti/j721e_evm.rst
@@ -111,7 +111,8 @@
 .. j721e_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, sysfw.itb, tispl.bin and u-boot.img.
 Each SoC variant (GP, HS-FS and HS-SE) requires a different source for these
 files.
diff --git a/doc/board/ti/j721s2_evm.rst b/doc/board/ti/j721s2_evm.rst
index fec2aca..5fbe608 100644
--- a/doc/board/ti/j721s2_evm.rst
+++ b/doc/board/ti/j721s2_evm.rst
@@ -6,6 +6,7 @@
 
 Introduction:
 -------------
+
 The J721S2 family of SoCs are part of K3 Multicore SoC architecture platform
 targeting automotive applications. They are designed as a low power, high
 performance and highly integrated device architecture, adding significant
@@ -38,6 +39,7 @@
 
 Boot Flow:
 ----------
+
 Below is the pictorial representation of boot flow:
 
 .. image:: img/boot_diagram_k3_current.svg
@@ -60,6 +62,7 @@
 
 Build procedure:
 ----------------
+
 0. Setup the environment variables:
 
 .. include::  k3.rst
@@ -120,7 +123,8 @@
 .. j721s2_evm_rst_include_end_build_steps
 
 Target Images
---------------
+-------------
+
 In order to boot we need tiboot3.bin, tispl.bin and u-boot.img. Each SoC
 variant (GP, HS-FS, HS-SE) requires a different source for these files.
 
diff --git a/doc/board/ti/k3.rst b/doc/board/ti/k3.rst
index 89d70db..1629d3b 100644
--- a/doc/board/ti/k3.rst
+++ b/doc/board/ti/k3.rst
@@ -238,7 +238,7 @@
 .. k3_rst_include_end_board_env_vars_desc
 
 Building tiboot3.bin
-^^^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^^^
 
 1. To generate the U-Boot SPL for the wakeup domain, use the following
    commands, substituting :code:`{SOC}` for the name of your device (eg:
@@ -273,7 +273,7 @@
    UBoot SPL will only look for and load the files with these names.
 
 Building tispl.bin
-^^^^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^^^^
 
 The `tispl.bin` is a standard fitImage combining the firmware need for
 the main domain to function properly as well as Device Management (DM)