man: reword "string is extended into PCR"

Originally, people used "extend a PCR with a measurement" or
"measure some blob into the PCR". In our docs those uses got merged
into "extend a string into a PCR". The meaning is clear to developers, but
it's a very jargony syntax that wouldn't make any sense to somebody who encounters
it the first time. Let's return to the more natural original phrasing.

Also, change various "this is supposed to act as" to "this acts as". If it
doesn't work, we have a bug to fix. This indirection is not useful.

Also, "boot path" → "phase path" and other smaller cleanups.

1 files changed, 6 insertions, 5 deletions

diff --git a/catalog/systemd.catalog.in b/catalog/systemd.catalog.in
index 4c29128f71..8d1812afcf 100644
--- a/catalog/systemd.catalog.in
+++ b/catalog/systemd.catalog.in
@@ -533,9 +533,10 @@ Subject: TPM PCR Extended
 Defined-By: systemd
 Support: %SUPPORT_URL%
 
-The string '@MEASURING@' has been extended into Trusted Platform Module's (TPM)
-Platform Configuration Register (PCR) @PCR@, on banks @BANKS@.
+The Trusted Platform Module's (TPM) Platform Configuration Register (PCR)
+@PCR@, on banks @BANKS@, has been extended with the string '@MEASURING@'.
 
-Whenever the system transitions to a new runtime phase, a different string is
-extended into the specified PCR, to ensure that security policies for TPM-bound
-secrets and other resources are limited to specific phases of the runtime.
+Whenever the system transitions to a new runtime phase, the specified PCR is
+extended with a different string, to ensure that security policies for
+TPM-bound secrets and other resources are limited to specific phases of the
+runtime.