Update developer guide

[L-rrrr]

Change / to $ for exact name search
Update use cases in dg

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...eedu/address/logic/parser/DeleteCommandParser.java	0.00%	0 Missing and 1 partial ⚠️
...ss/model/person/NameContainsKeywordsPredicate.java	50.00%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
src/main/java/seedu/address/logic/Messages.java	93.33% <ø> (ø)	7.00 <0.00> (ø)
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
...va/seedu/address/logic/commands/DeleteCommand.java	100.00% <ø> (ø)	9.00 <0.00> (ø)
...logic/commands/reminder/DeleteReminderCommand.java	89.65% <100.00%> (ø)	7.00 <0.00> (ø)
...s/logic/commands/reminder/EditReminderCommand.java	78.94% <ø> (ø)	8.00 <0.00> (ø)
...du/address/logic/parser/FindNameCommandParser.java	100.00% <100.00%> (ø)	4.00 <0.00> (ø)
src/main/java/seedu/address/model/person/Name.java	100.00% <ø> (ø)	9.00 <0.00> (ø)
...el/person/NameContainsKeywordsDeletePredicate.java	100.00% <100.00%> (ø)	11.00 <1.00> (ø)
...eedu/address/logic/parser/DeleteCommandParser.java	55.55% <0.00%> (ø)	3.00 <0.00> (ø)
...ss/model/person/NameContainsKeywordsPredicate.java	90.47% <50.00%> (ø)	10.00 <1.00> (ø)

[rubinnn]

LGTM