tweaks

ch07_authorization-authentication.adoc

@@ -133,7 +133,6 @@ validation.
 image::images/mbc3_0701.png["input_and_output_scripts"]
 
 
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 ===== The script execution stack
 
 Bitcoin's ((("scripts", "stack", id="script-stack")))((("stack", id="stack")))scripting language is called a stack-based language because it

ch12_mining.adoc

@@ -954,7 +954,7 @@ resulting in a retargeting bias toward higher difficulty by 0.05%.
 <<retarget_code>> shows the code used in the Bitcoin Core client.
 
 [[retarget_code]]
-.Retargeting the proof of work: [.plain]#++CalculateNextWorkRequired()++# in pow.cpp
+.Retargeting the proof of work: [.plain]#++CalculateNextWorkRequired()++# in [.plain]#pow.cpp#
 ====
 [source,cpp]
 ----
@@ -2024,7 +2024,6 @@ in older software. In short, we should not expect to see reuse until all
 29 bits have been used once.
 ====
 
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 Proposed changes are identified by a data structure that contains the following fields:
 
 name:: A short description used to distinguish between proposals. Most