add list indexing to CREATE INDEX sql ref entry

[gramian]

• Add index properties (Section 3.9)
• Add argument reference to backup section (Section 5.6)
• Add case insensitive mod to SQL filtering table (Section 7.2)
• Clarify Importer link under IMPORT DATABASE (Section 7.3)
• Add BY ITEM list indexing to CREATE INDEX in SQL refernece (Section 7.3)
• Fix custom function Java example (Section 7.7)
• Show PHP and alternative Python drivers in table (Section 9)
• Prepare Python bindings (Section 9.9)
• Fix setting name and typo (Section 10.2)

[mergify]

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[lvca]

Awesome, thanks @gramian !