Fix rendering of vector type tables

[craigblackmore]

Table 2 does not render for me in github. Delimiting the end of the table resolves this.

Also add newline after Table 2 header row so that it appears in bold like in Table 1.

[kito-cheng]

vector_type_infos.adoc is generated file, could you fix that on gen_vector_type_infos.py?

Thanks :)

[craigblackmore]

New changes:

• Fixed Table 1 header.
• Updated gen_vector_type_infos.py and regenerated.