Make "bitcoin" v "Bitcoin" consistent

Made "bitcoin" v "Bitcoin" consistent by using Bitcoin for the protocol and idea, and bitcoin for the units, which I believe is conventional style.

Author: BitcoinErrorLog

bip-0177.mediawiki

@@ -43,12 +43,12 @@ By redefining the base unit as "one bitcoin," this BIP aligns user perception wi
 
 Example 1:
 
-* Old display: <code>0.00010000 Bitcoin</code>
+* Old display: <code>0.00010000 bitcoin</code>
 * New display: <code>₿10,000</code> or <code>10,000 bitcoins</code> or <code>0.00010000 BTC</code>
 
 Example 2:
 
-* Old display: <code>10.23486 Bitcoin</code>
+* Old display: <code>10.23486 bitcoin</code>
 * New display: <code>₿1,023,486,000</code> or <code>1,023,486,000 bitcoins</code> or <code>10.23486 BTC</code>
 
 Example 3:
@@ -62,7 +62,7 @@ NOTE: Traditional number display abbreviations, like <code>2.5M</code> for milli
 
 * Ledger and consensus rules remain unchanged.
 * <code>BTC</code> as a currency code remains unchanged (1 BTC = 100,000,000 base units)
-* Implementations adopting this standard MUST multiply previously displayed Bitcoin amounts by 100,000,000 to determine the new integer representation.
+* Implementations adopting this standard MUST multiply previously displayed bitcoin amounts by 100,000,000 to determine the new integer representation.
 
 ===Rationale===