Docs: Update Crypto docs

Updates the Crypto service documentation to reflect changes to the
code.

Change-Id: I5412348d9c1437a78c685cfa2f0a2f3bcea1ab62
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
diff --git a/docs/design_documents/tfm_crypto_design.rst b/docs/design_documents/tfm_crypto_design.rst
index 9ad3312..d49c043 100644
--- a/docs/design_documents/tfm_crypto_design.rst
+++ b/docs/design_documents/tfm_crypto_design.rst
@@ -166,7 +166,7 @@
    +-------------------------------+---------------------------+----------------------------------------------------------------+-----------------------------------------+----------------------------------------------------+
    | **Parameter**                 | **Type**                  | **Description**                                                | **Scope**                               | **Default**                                        |
    +===============================+===========================+================================================================+=========================================+====================================================+
-   | ``CRYPTO_ENGINE_BUF_SIZE``    | CMake build               | Buffer used by Mbed Crypto for its own allocations at runtime. | To be configured based on the desired   | 1024 (bytes)                                       |
+   | ``CRYPTO_ENGINE_BUF_SIZE``    | CMake build               | Buffer used by Mbed Crypto for its own allocations at runtime. | To be configured based on the desired   | 8096 (bytes)                                       |
    |                               | configuration parameter   | This is a buffer allocated in static memory.                   | use case and application requirements.  |                                                    |
    +-------------------------------+---------------------------+----------------------------------------------------------------+-----------------------------------------+----------------------------------------------------+
    | ``CRYPTO_CONC_OPER_NUM``      | CMake build               | This parameter defines the maximum number of possible          | To be configured based on the desire    | 8                                                  |
@@ -174,7 +174,7 @@
    |                               |                           | for multi-part operations, that can be allocated simultaneously|                                         |                                                    |
    |                               |                           | at any time.                                                   |                                         |                                                    |
    +-------------------------------+---------------------------+----------------------------------------------------------------+-----------------------------------------+----------------------------------------------------+
-   | ``CRYPTO_IOVEC_BUFFER_SIZE``  | CMake build               | This parameter applies only to IPC mode builds. In IPC mode,   | To be configured based on the desired   | 1024 (bytes)                                       |
+   | ``CRYPTO_IOVEC_BUFFER_SIZE``  | CMake build               | This parameter applies only to IPC mode builds. In IPC mode,   | To be configured based on the desired   | 5120 (bytes)                                       |
    |                               | configuration parameter   | during a Service call, input and outputs are allocated         | use case and application requirements.  |                                                    |
    |                               |                           | temporarily in an internal scratch buffer whose size is        |                                         |                                                    |
    |                               |                           | determined by this parameter.                                  |                                         |                                                    |