docs: corrected readme example for memory format (#458)

Smallest update in history... memory format in readme showed an example
as 1024Gib.

The b is not allowed in gcloud so have removed for accuracy.

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Signed-off-by: richw-kai <96179977+richw-kai@users.noreply.github.com>

Author: richw-kai

README.md

@@ -193,7 +193,7 @@ jobs:
 
 -   <a name="memory"></a><a href="#user-content-memory"><code>memory</code></a>: _(Optional)_ The amount of memory available for the function to use. Allowed values are
     of the format: <number><unit> with allowed units of "k", "M", "G", "Ki",
-    "Mi", "Gi" (e.g 128M, 10Mb, 1024Gib).
+    "Mi", "Gi" (e.g 128M, 10Mb, 1024Gi).
 
     For all generations, the default value is 256MB of memory.