doc:  clarify syntax notation, particularly parentheses

Also move TCL syntax to the PL/tcl section.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 10

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9d179d9c23b9d4cc1a4ffa02e4de79114de064d7

Modified Files
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doc/src/sgml/notation.sgml | 6 +++---
doc/src/sgml/pltcl.sgml    | 6 ++++--
2 files changed, 7 insertions(+), 5 deletions(-)

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