Fix typos and misspellings

Fix a number of typos and misspellings in TF-A
documentation and comments.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
Change-Id: I34c5a28c3af15f28d1ccada4d9866aee6af136ee
diff --git a/docs/process/coding-style.rst b/docs/process/coding-style.rst
index 94fd85e..be13b14 100644
--- a/docs/process/coding-style.rst
+++ b/docs/process/coding-style.rst
@@ -101,7 +101,7 @@
 parentheses.
 
 Control statements (``if``, ``for``, ``switch``, ``while``, etc) must be
-separated from the following open paranthesis by a single space. The previous
+separated from the following open parenthesis by a single space. The previous
 example illustrates this for an ``if`` statement.
 
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