PCA section in SVD lecture

[sidd3888]

Made the changes referenced in issue #396.

[HumphreyYang]

Many thanks @sidd3888 for contributing! We will get this merged very soon once we get green ticks.

[mmcky]

thanks for reviewing @HumphreyYang -- greatly appreciated.

thanks @sidd3888 for the PR.

@HumphreyYang would you mind to review the merge conflict?

[HumphreyYang]

thanks for reviewing @HumphreyYang -- greatly appreciated.

thanks @sidd3888 for the PR.

@HumphreyYang would you mind to review the merge conflict?

Thanks @mmcky,

I fix the lecture bayes_nonconj because it is not building properly. I will wait to see if #395 is building : )

If #395 builds, I will revert my changes in favor of the main.

[mmcky]

thanks @HumphreyYang. This OK to merge now?