fix(docs): typo in the romlib design

There's a typo in the romlib design document when referring to
the generator script. It should be romlib_generator.py instead
of romlib_generate.py so fixed this typo.

Change-Id: I6db7ee66b13c2b0b9d8511da7e0d1b058366281b
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/docs/components/romlib-design.rst b/docs/components/romlib-design.rst
index d34b3cc..62c173a 100644
--- a/docs/components/romlib-design.rst
+++ b/docs/components/romlib-design.rst
@@ -74,10 +74,10 @@
 Script
 ~~~~~~
 
-There is a ``romlib_generate.py`` Python script that generates the necessary
+There is a ``romlib_generator.py`` Python script that generates the necessary
 files for the "library at ROM" to work. It implements multiple functions:
 
-1. ``romlib_generate.py gentbl [args]`` - Generates the jump table by parsing
+1. ``romlib_generator.py gentbl [args]`` - Generates the jump table by parsing
    the index file.
 
 2. ``romlib_generator.py genvar [args]`` - Generates the jump table global
@@ -93,10 +93,10 @@
    generate a dependency file of the included index files which can be directly
    used in makefiles.
 
-Each ``romlib_generate.py`` function has its own manual which is accessible by
+Each ``romlib_generator.py`` function has its own manual which is accessible by
 runing ``romlib_generator.py [function] --help``.
 
-``romlib_generate.py`` requires Python 3 environment.
+``romlib_generator.py`` requires Python 3 environment.
 
 
 Patching of functions in library at ROM