Standardize indentation of XSL files

Predominant standard is two spaces, so adjust outliers to that.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/2856c51c86857f2df674a37609515d26311062e9

Modified Files
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doc/src/sgml/stylesheet-man.xsl |   22 +++++++++++-----------
1 files changed, 11 insertions(+), 11 deletions(-)

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