docs: fix typos and common misspellings (#1668)

docs/dev/basics.rst

docs/dev/hardware.rst

docs/dev/packages.rst

docs/dev/web/config-mode.rst

docs/dev/web/model.rst

docs/features/monitoring.rst

docs/features/multidomain.rst

docs/features/private-wlan.rst

docs/features/wired-mesh.rst

docs/index.rst

docs/package/gluon-config-mode-domain-select.rst

docs/package/gluon-radv-filterd.rst

docs/package/gluon-scheduled-domain-switch.rst

docs/package/gluon-web-admin.rst

docs/releases/v2014.3.rst

docs/releases/v2014.4.rst

docs/releases/v2015.1.2.rst

docs/releases/v2015.1.rst

docs/releases/v2016.1.1.rst

docs/releases/v2016.1.2.rst