FIX: Documentation for for 0.14.1 change log

Missing code reference in change log documentation
BUG: PeriodIndex.unique results in Int64Index
COMPAT: SettingWithCopy will now warn when slices which can generate views
        are then set
Merge pull request #7845 from jreback/setting_with_copy

COMPAT: SettingWithCopy will now warn when slices which can generate views are then set
Merge pull request #7843 from sinhrks/punique

BUG: PeriodIndex.unique results in Int64Index
BUG/VIS: rot and fontsize are not applied to minor ticks
CLN: cln tslib, frequencies
BUG: don't force date parsing in read_html

Necessitates the deprecation of the ``infer_types`` argument.
Merge pull request #7851 from cpcloud/read-html-date-parsing

BUG: fix greedy date parsing in read_html
Merge pull request #7854 from sinhrks/tslib_cln

CLN: Clean tslib, frequencies import
Merge pull request #7844 from sinhrks/minor_rot

BUG/VIS: rot and fontsize are not applied to timeseries plots
Merge pull request #7769 from bashtage/doc-stata-fix

FIX: Documentation for for 0.14.1 change log