Add missing PhpDoc

[connorhu]

My goal is to have phpdoc

• before each class: DQL function syntax (like ORM does), DQL example and link
• type definition for each property, based on what the parser function returns

This will later make it easier to create parser implementation traits.

• Postgres

Oracle

• Oracle/Ceil.php
• Oracle/Day.php
• Oracle/Floor.php
• Oracle/Hour.php
• Oracle/Listagg.php
• Oracle/Minute.php
• Oracle/Month.php
• Oracle/Nvl.php
• Oracle/Second.php
• Oracle/ToChar.php
• Oracle/ToDate.php
• Oracle/Trunc.php
• Oracle/Year.php

Sqlite

• Sqlite/AbstractStrfTime.php
• Sqlite/ConcatWs.php
• Sqlite/Date.php
• Sqlite/DateFormat.php
• Sqlite/Day.php
• Sqlite/Greatest.php
• Sqlite/Hour.php
• Sqlite/IfElse.php
• Sqlite/IfNull.php
• Sqlite/JulianDay.php
• Sqlite/Least.php
• Sqlite/Minute.php
• Sqlite/Month.php
• Sqlite/NumberFromStrfTime.php
• Sqlite/Random.php
• Sqlite/Replace.php
• Sqlite/Round.php
• Sqlite/Second.php
• Sqlite/StrfTime.php
• Sqlite/Week.php
• Sqlite/WeekDay.php
• Sqlite/Year.php

Mysql

• Mysql/A*
• Mysql/B*
• Mysql/C*
• Mysql/D*
• Mysql/E*
• Mysql/F*
• Mysql/G*
• Mysql/H*
• Mysql/I*
• Mysql/J*
• Mysql/L*
• Mysql/M*
• Mysql/N*
• Mysql/Over.php
• Mysql/P*
• Mysql/Quarter.php
• Mysql/R*
• Mysql/SecToTime.php
• Mysql/Second.php
• Mysql/Sha1.php
• Mysql/Sha2.php
• Mysql/Sin.php
• Mysql/Soundex.php
• Mysql/Std.php
• Mysql/StdDev.php
• Mysql/StrToDate.php
• Mysql/SubstringIndex.php
• Mysql/T*
• Mysql/U*
• Mysql/Variance.php
• Mysql/W*
• Mysql/Y*