Update 1-Introduction.rst

ReST markup: Definition term is "strong" by default
Update 1-Introduction.rst

Content and spelling corrections.
Update 1-Introduction.rst

Spelling and wording
Update Index.rst

Target labels for crossreferencing must be unique in the documentation project.
Update 2-Preparation.rst

Change wording and spelling. Add an external link to EXT:smoothmigration.
Update Index.rst

Be more consistent with forming labels as already done elsewhere in this project.
Update 1-Introduction.rst

Change wording. Make label unique.
Update 3-UpgradeProcess.rst

[WIP] Saving before lunch ...
Update 3-UpgradeProcess.rst

Change wording and spelling, add an "attention" admonition.
Update 4-UpgradeDAMtoFAL.rst

Change ReST markup for the link.
Merge pull request #1 from marble/master

Changes by marble