manuals: improve initramfs details

- Create a new entry in the glossary
- Add implementation details
- Replace the mention of "init ramdisk" by "initramfs¨
  whenever possible
- Remove obsolete and duplicate information
- Fix spacing issues in the Sphinx code

(From yocto-docs rev: 952c7e6dee49532705b2c162f4728e635c38df3f)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/documentation/ref-manual/classes.rst b/documentation/ref-manual/classes.rst
index 11e0d472e8..f402d090c9 100644
--- a/documentation/ref-manual/classes.rst
+++ b/documentation/ref-manual/classes.rst
@@ -1256,9 +1256,9 @@ package installs all packages with modules and various other kernel
 packages such as ``kernel-vmlinux``.
 
 The ``kernel`` class contains logic that allows you to embed an initial
-RAM filesystem (initramfs) image when you build the kernel image. For
-information on how to build an initramfs, see the
-":ref:`dev-manual/common-tasks:building an initial ram filesystem (initramfs) image`" section in
+RAM filesystem (:term:`Initramfs`) image when you build the kernel image. For
+information on how to build an :term:`Initramfs`, see the
+":ref:`dev-manual/common-tasks:building an initial ram filesystem (Initramfs) image`" section in
 the Yocto Project Development Tasks Manual.
 
 Various other classes are used by the ``kernel`` and ``module`` classes