This pull request corrects several grammatical errors and typos in BIP-0329.mediawiki and BIP-0078.mediawiki files.

Changes in BIP-0329.mediawiki:

Fixed incorrect word "independant" to "independent" in line 164:

• • <tt>keypath</tt>: The data needed to build full descriptor down to the specific address. This extends <tt>origin</tt> with the final two components that are unhardened (in the typical case, assuming BIP-84). Provide string <tt>/1/123</tt> for <tt>wpkh([d34db33f/84'/0'/0'/1/123])</tt>. If the first character is not <tt>/</tt>, then it should be interpreted as a full descriptor, independant of <tt>origin</tt> (if any).

• • <tt>keypath</tt>: The data needed to build full descriptor down to the specific address. This extends <tt>origin</tt> with the final two components that are unhardened (in the typical case, assuming BIP-84). Provide string <tt>/1/123</tt> for <tt>wpkh([d34db33f/84'/0'/0'/1/123])</tt>. If the first character is not <tt>/</tt>, then it should be interpreted as a full descriptor, independent of <tt>origin</tt> (if any).

Changes in BIP-0078.mediawiki:

1. Fixed subject-verb agreement errors:
   • There is several cases where a fee output is useful:
   • There are several cases where a fee output is useful:
2. Fixed spelling error:
   • Note that if payment output substitution is disallowed, the reveiver can still increase the amount of the output. (See [[#reference-impl|the reference implementation]])
   • Note that if payment output substitution is disallowed, the receiver can still increase the amount of the output. (See [[#reference-impl|the reference implementation]])

ACK, hopefully we'll soon run out of these kinds of minor fix-ups