#398 Comments typos in latest codebase - r6768/9

[Ap Muthu]

The latest trunk code at:
https://sourceforge.net/p/xigmanas/code/6769/tree//trunk/etc/inc/install.inc
can be compared with
https://github.com/apmuthu/xigmanas/blob/131ea4c84fbf84d945211a79b26f643f6dc21c64/core/etc/inc/install.inc
for changes in the latter suggested for pulling in at:
Line 589 comment standardised
Line 642 missing comment restored
Line 921: conent => content

[ms49434]

cosmetic changes only.

[Ap Muthu]

changes incorporated in r6770/1.