[DOCS] Empty index in A4 version of 8.1 PDF documentation

I just downloaded the current documentation PDFs and found that the A4 version has no index whereas the US version does ... Benno ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster

[DOCS] Outdated note

On 4.1.2.1. String Constants, the following note appears: Note: While ordinary strings now support C-style backslash escapes, future versions will generate warnings for such usage and eventually treat backslashes as literal characters to be standard-conforming. That future version is 8.2,