docs: fix 13 typos in code comments and docblocks

[Avicennasis]

Summary

Spelling and grammar fixes in PHP comments and docblocks only. No identifier, no translation string and no behaviour is changed.

Reported by an automated spell scan (7 applied, 2 declined)

• src/module.php: // we need ot init the settings page objects here -> to
• src/module.php: // as they are needed by two the callbacks to seperate WordPress Hooks ... -> by the two callbacks to separate ... (the reported seperate, plus the transposed two the on the same line)
• src/module.php: // iterate throught group of settings fields. -> through
• src/module.php: // iterate throug thhe fields in the group -> through the
• src/module.php: // regsiter the settings pages with WordPress -> register
• src/module.php: * Inititalizes Settings Page Objects -> Initializes
• src/settings/field.php: // name of the santizer callback to be used -> sanitizer

Two further reported items are not applied, because they are identifiers and renaming them would be a breaking API change:

• module::loadDependancies() in src/module.php
• field::$santizer_callback in src/settings/field.php - only the comment above it is corrected, so the property name is untouched

Found alongside them, not in the original report (6)

• owa-plugin.php: // bail if this isn't a request type that OWA needs ot be loaded on. -> to (the same ot typo as above)
• owa-plugin.php: * Singelton -> Singleton
• owa-plugin.php: // remove this if uneeded -> unneeded
• owa-plugin.php: * Trackes new and edited post actions. -> Tracks
• src/settings/page.php: // set a false value in case it's a boollean type -> boolean
• src/settings/page.php: // because it doesn't allows for filtered output -> doesn't allow

The copyright/licence header in owa-plugin.php is untouched. Each file was edited byte-wise with an occurrence-count and length-delta assertion, so the diff is exactly one line per fix (4 files, 13 insertions, 13 deletions).